This Halacha is an excerpt from our Sefer
Leaving a gentile, or non-religious Jew, alone in one’s home and how it effects the Kashrus of one’s kitchen:
*Important note 1-The food in the home: The law below only discusses the issues posed to the kitchen utensils by leaving a gentile alone in one’s home. A second severe issue that is relevant, is the status of the open foods left in the home, as all foods which are not properly sealed become Rabbinically forbidden if left in the hands of a gentile. This especially applies to an open meat packet in the freezer, or an open bottle of wine.
**Important note 2-Rentals: The law below only discusses the case that the gentile, or non-religious Jew, that was left alone in the home is a mere visitor, guest, or maid. However, if the gentile or non-religious Jew rented the home, such as a Tzimmer rental, then all the vessles must be Koshered in all cases, as explained in Q&A.
It is initially forbidden to allow a gentile [or non-religious Jew] to remain alone with one’s eating utensils/vessels due to worry that he may use the vessels to cook non-Kosher foods [either non-Kosher ingredients or meat with milk]. This applies even if one plans to not use the vessels again until after 24 hours. This applies whether one desires to leave a vessel in the house of a gentile, or desires to leave a gentile alone in his home. [This applies even if one instructs the gentile not to use the utensils.]
Yotzei Venichnas: If one is coming in and out of the house constantly, then it is permitted to leave the gentile alone in one’s home even initially.
Leaving a gentile at home while food is cooking: One is to be stringent not to leave pots [of cooking food] with one’s gentile maid, if no Jews will remain at home. If, however, one is constantly coming in and out of the house, than one may do so, as stated above. If, however, the maid knows that one will be gone for quite some time, such as he will be leaving to go to Shul and the like, one should be stringent.
*Important note: This law of Bedieved only applies in a case that the gentile or non-religious that was left alone in the home is a mere guest or maid. However, if the gentile or non-religious Jew rented the home, such as a Tzimmer rental, then all the vessles must be Koshered, as explained in Q&A.
Within 24 hours: If one transgressed, and left a gentile alone with his vessels, then he may not use his vessels [with hot foods] until the passing of slightly more than 24 hours from when the vessel was first left by the gentile. If one transgressed and cooked food in the vessel within 24 hours, the food is forbidden. Some Poskim, however, are lenient in a time of need, while others forbid the food in all cases.
After 24 hours: After slightly more than 24 hours have passed [since it was first left alone with the gentile], the vessels may be used as usual [even with a Davar Charif]. [Thus, if the gentile was left alone in the home starting from 10:00 am that morning and remained there until 7:00 pm, then it may be used again starting from 10:00 am the next morning and one is not required to wait until 7:00 pm the next day.] Certainly, it may be used after 24 hours have passed since he retrieved the vessel from the gentile [i.e. 7:00 pm]. Some Poskim however rule that if one left the vessels with the gentile Bemeizid, then the vessels are forbidden even after 24 hours and either must be Kashered [i.e. metal] or broken [i.e. earthenware]. If, however, the vessels were left with the gentile by mistake, then one may be lenient after 24 hours if the vessel is not Kasherable, while if it is Kasherable it is to be Kashered. [Practically, if one left the vessels with the gentile Beshogeig and 24 hours passed since one retrieved the vessels, one may be lenient to use them without Kashering.]
Vessels not commonly used for hot foods and law of cups: The above requirement to wait 24 hours only applies to vessels that are commonly eaten with hot foods [of a Keli Rishon or vessels that are used to drink wine]. However, those vessels that are not commonly used with hot foods [of a Keli Rishon, and are not used to drink wine] may be used even within the 24 hours, so long as they are properly washed. [Accordingly, only pots, pans and serving spoons that are commonly used with a Keli Rishon or Iruiy Keli Rishon must be delayed 24 hours prior to use. However, forks, spoons, and knives, and the like that are only commonly used for a Keli Sheiyni, or for cold, may be used even right away. Cups that are designated for use of drinking wine, such as wine goblets, must be Kashered even after the passing of 24 hours. However, glass wine cups do not need to be Kashered and a good rinse suffices. However, one is to rinse it three times prior to use.]
Leaving the vessel by the gentile for short amount of time: The above law only applies if the vessels remained in the home with the gentile for a considerable amount of time, such as half a day, however if it remained there for a mere hour, the vessels may be used as usual.
It is forbidden to leave one’s eating utensils, cookware, or food that is in the midst of cooking, in the care of a gentile [or a non-religious Jew], unless one is entering and exiting the area constantly. If one accidently did so [and the gentile was a mere visitor or guest, and not a renter], then all vessels that are commonly used with hot Keli Rishon foods are not to be used until after 24 hours. Vessels that are only commonly used with cold or Keli Sheiyni foods are permitted to be used right away. Vessels that are designated to be used to drink or store wine, may not be used even after 24 hours, until they are Koshered. All open foods that require seals when left with a gentile become non-Kosher.
Practical application with maids:
Based on the above, all those who have gentile maids who work at home must beware to never leave the maid alone in the house for a long period of time, in a way that is not defined as “entering and exiting constantly.” Thus, by a family outing, the maid is to come with them. Likewise, during the day hours when the parents are out at work and the children are out at school, the maid is not to be employed or be allowed to remain in the home. Accordingly, employing a gentile live-in-maid poses a serious Kashrus challenge, and may not be done if the parents both work and the children are in school, as there is no one who remains with her at home.
May one leave eating utensils alone with a non-religious Jew?
A Jew who is known to desecrate Shabbos in public is considered like a gentile for all matters and is hence to be treated like a gentile regarding the above law. It is thus forbidden to leave him/her alone in one’s home with one’s Kosher kitchen unless a Jew is constantly coming in and out of the house. Bedieved, if one transgressed and left him in the home alone, it follows the same law as a gentile being left alone in the home in which case all the vessels are permitted after 24 hours, and vessels commonly used with cold are permitted even within 24 hours. Regarding cups, seemingly one may be lenient even within 24 hours.
If one rented his home or Tzimmer to a gentile, or non-religious Jew, what is the status of the vessels?
In such a case, all the vessels must be Koshered, and the leniency of waiting 24 hours does not apply.
May one do a home swap with a gentile or non-religious Jew?
One may not do so, due to the Kashrus issues stated above. If one did so, then the kitchen and its utensils must be Koshered, as it contains the same status of a home rental, as stated above.
May one do a home swap with a religious Jew who follows different Hashgacha’s or Kashrus standards?
Yes. However, if they plan to make use of the kitchen, then one should instruct them as to the Hechsheirim that they can use. For example, if a Sephardi is home swapping with an Ashkenazi, then the Ashkenazi should be forewarned not to cook any Chadash grain products, or any meat that is no Glatt Kosher. Likewise, one who does not eat Heter Mechira during the Shemita year is to instruct the family accordingly.
If one has a home video surveillance system [i.e. CCTV] may a gentile or non-religious Jew be left there alone?
It is only valid if all the following conditions are fulfilled:
a) The gentile or non-religious Jew is aware of the video surveillance.
b) The gentile or non-religious Jew is made aware that they do not have permission to use the kitchen utensils.
c) The Jew will look at the surveillance video.
 Michaber/Rama Y.D. 122:9; Mordechai Perek Ein Mamidim, quoted in Taz 122:8; Igros Moshe Y.D. 3:61
 See Q&A!
 Igros Moshe Y.D. 3:61
 Michaber ibid; Mordechai ibid
 Rama ibid; Shach 122:8; Taz 122:8
 Michaber Y.D. 122:9 regarding bringing to house of gentile; Rama ibid that the same applies to leaving a gentile in one’s home “And initially one is to be careful in all cases even regarding maids and slaves in ones home, that our vessels should not remain with them as they amy come to use them with not Kosher food”; Mordechai ibid likewise mentions both cases; See Igros Moshe Y.D. 3:61 who even regarding bedieved treats the latter case the same as the former
 Shach 122:9 that so is custom today being that one may even initially rely on Yotzei Venichnas; Rama 118:12 brought next
 Michaber 118:12; Tur in name of Rosh Kelal 19:18; Vetzaruch Iyun why the Poskim here make no mention of the discussion of Bedieved in 122:9; Perhaps one can say there is a difference between one’s maid working in one’s house [the case here], in which we are always lenient Bedieved, and a case where one sends his item to the gentile’s house [the case in 122]. Vetzaruch Iyun. See coming footnotes in Bedieved.
The reason: As she may cook non-Kosher food in it. [Shach 118:37]
 Rama ibid
 Shach 118:37 in conclusion of opinion of Rama in Tur and Rosh ibid
 Rama Y.D. 122:9
Other opinions: Some Poskim rule that the entire issue of not leaving one’s vessel entrusted with a gentile is only initially, while Bedieved, it may be used at all times. [Implication of Michaber 118:12 and 122:9 who simply writes “Yeish Lehachmir and Yeish Lizaher” and so learns Aruch Hashulchan 122:18 in Michaber] The reason for this is because “Lo Machzakinan Issura” for a mere Chashash. [See Aruch Hashulchan 122:20]
Is there a difference between if one left the vessel by the gentile’s home or left the gentile in one’s home alone regarding Bedieved? The Michaber and Rama ibid entirely deal with a case that one brought his vessel to the house of a gentile, and only in the end does the Rama conclude that one is to be stringent Lechatchila even when leaving a maid in one’s home. This seems to imply that they have different laws Bedieved. If correct, this would explain why in 118:12 no mention is made in Poskim regarding Bedieved, as is done here. See also Taz ibid and Mordechai ibid who seem to differentiate and say that in the Jews home, we do allow the Sfeik Sfeika to permit using the vessel after 24 hours. However, see Mordechai ibid who concludes even by knives in Jews home “Venachon Lehachmir.” See also Igros Moshe ibid who makes no differentiation between the cases and applies the Bedieved ruling of here to a case where a gentile was left in one’s home for some time. Vetzaruch Iyun!
 As it takes time for the gentile to cook his food, and hence, enough time must pass for one to be able to question whether 24 hours has passed since his first use. [See Rama ibid who directly implies this] However, see Shach ibid whose wording is “If it stayed by the gentile for 24 hours..”; See Mahariy Bruno 27, brought in Darkei Teshuvah 122:40 “Stayed by gentile for two days”
 Rama ibid; Shach 122:8; Taz 122:8; Mordechai ibid
The reason: So long as 24 hours have not passed since the gentile could have possibly used the vessel, then there is only one doubt, which is that perhaps he used it and perhaps he did not. [Rama ibid] Alternatively, we assume the gentile used it, and it is not considered a doubt at all. Nevertheless, what is a doubt is whether he used it for a food that is Pogem or not. [Taz 122:8 in negation of Ram’s doubt; Mordechai ibid]
 Rama ibid; Taz ibid
The reason: As there is only one Safek, perhaps he cooked food in it or perhaps he didn’t, and by a Biblical doubt one must be stringent. [Rama ibid] Alternatively, we assume for certain that he cooked in it, and the doubt is whether he cooked a Davar Pogem or not. [Taz ibid; Mordechai ibid]
 Rama ibid based on Svaras Atzmo; Poskim brought in Darkei Teshuvah 122:40; Aruch Hashulchan 122:20 and that so is implied from Shach ibid
The reason: As one can argue that even here there is a Sfek Sfeika: a) Perhaps he did not cook in it at all, and b) Even if he did, perhaps he cooked a Davar Pogeim. [Poskim brought in Darkei Teshuvah 122:40; See Taz ibid] Alternatively, as the entire matter is a mere Chashash, and thus Bedieved, Lo Machzikinan Issura. [Aruch Hashulchan 122:20]
 Taz ibid; Mordechai ibid; Aruch; Beis Lechem Yehuda 122:9, brought in Darkei Teshuvah 122:40
 Chamudei Daniel Taaruvos 7, brought in Darkei Teshuvah 122:42, that so is implied from Setimas Haposkim
The reason: As perhaps the non-Kosher food that was cooked is Pegam in the new food. [ibid]
 Rama 122:9 as explained in Shach 122:8 and so is final ruling of Shach ibid; Reah; Toras Chatas 59:4; Taz 122:8 regarding if left by gentile Beshogeg and not Kasherable
The reason: As within the 24 hours there is only a single Safek; whether he used the vessel for non-Kosher or not. [Rama ibid] This doubt is a Biblical doubt. However, after 24 hours from the time it began staying with the gentile, it is a Sfek Sfeika, as a) Perhaps he did not use it at all and b) Even if he did, perhaps he used it 24 hours ago and it is no longer Ben Yomo. Now, throughout the entire Torah we permit Sfek Sfeika even by a Biblical prohibition. [Implication of Rama ibid; See Taz ibid] Alternatively, we assume that he definitely used the vessels for non-Kosher food and the Sfeik Sfeika is as follows: a) Perhaps 24 hours have passed since he used it and b) Even if used within 24 hours, perhaps it was used with a Davar Pogeim. [Taz ibid based on Mordechai ibid]
Other opinions: Some Poskim rule one may not use the vessel even after 24 hours, and hence if made of metal it must be Kashered, while if made of earthenware it must be destroyed. [Implication of Mordechai, brought in Taz ibid; Implication of Issur Viheter, brought in Shach ibid; Bach 122 and 137] Some Poskim rule it is never permitted until 24 hours pass from the time it was retrieved from the gentile. [Chesed Leavaraham Kama Y.D. 40, brought in Darkei Teshuvah 122:40]
 See Chesed Leavaraham Kama Y.D. 40, brought in Darkei Teshuvah 122:40, who establishes the case of allowance to be only when 24 hours pass since retrieving from the gentile, as perhaps he used it towards the end of the day. See also Igros Moshe ibid
The reason: As now we know for certain that 24 hours have passed since a last use and the entire doubt is only Rabbinical, as after 24 hours the taste is Pagum and is only Rabbinically forbidden. Now, by a Rabbinical doubt we rule leniently. [See Shach 122:8 in name of Maharash Mebonburg]
Other opinions: The above stringent Poskim are stringent even in this case, as no differentiation is made. Seemingly, the reason is as suggests the Taz ibid, that we never allow one to initially rely on a Safeik.
 Taz 122:8; Other Poskim who are stringent after 24 hours [but make no distinction of Shogeg/Meizid]: Implication of Mordechai, brought in Taz ibid; Implication of Issur Viheter, brought in Shach ibid; Bach 122 and 137
Is there a difference between if one left the vessel by the gentile’s home or left the gentile in one’s home alone? See Taz ibid and Mordechai ibid who seem to differentiate and say that in the Jews home we do allow the Sfeik Sfeika to permit using the vessel after 24 hours. However, see Mordechai ibid who concludes even by knives in Jews home “Venachon Lehachmir”
 The reason: As we never allow one to initially rely on a Sfek Sfeika [or Safeik Derabanan]. [Taz ibid]
 Igros Moshe Y.D. 3:61
 Shach 122:8 [towards end]
 Aruch Hashulchan 122:20
 See Rama 136:1; Tur 136; Shach 122:8; Taz 122:8
 Aruch Hashulchan 122:20
 Vetzaruch Iyun regarding Kiddush cups as gentiles don’t usually know that they are designated for wine.
 Rama Y.D. 136:1 that it must be Kashered if no Chosem; Tur 136; Shach 122:8 and 136:3
The reason: Although it is not possible for the vessel to absorb wine in such a short amount of time, nevertheless, it may not be used until it is Kashered being the Sages considered a temporary stay of the vessel by the gentile, as if it had stayed there permanently. [Shach ibid; Tur ibid; Beis Yosef 136] Accordingly, we are only stringent in this case that the vessel was in possession of the gentile, although if he simply drank wine from it in front of us, the vessel does not need to be Kashered. Furthermore, perhaps this stringency of wine cups only applies if one sends it to a gentile, and not if one left a gentile in one’s home. Vetzaruch Iyun
Other opinions: Some Poskim rule one may use the cup after 24 hours. [Bach 122 and 136, brought in Shach ibid] Other Poskim rule it does not need to be Kashered at all, and may be used even within 24 hours. [Beis Yosef 136 in name of Ran Avoda Zara 39a in name of Reah, in name of Ramban]
 Michaber Y.D. 135:8 that by glass is not a problem even if stored in it; See Michaber and Rama 136:1 that vessels designated for wine require a Chosem and otherwise need to be Kashered; However, see Shach 136:3 that the entire stringency here is because it’s as if he entered it for storage, and hence since by glass we are lenient even if it is entered for storage, therefore it does not need to be Kashered.
 Michaber Y.D. 135:11; Tur 135; Rabbeinu Tam in Tosafus Avoda Zara 33a; This applies even if one desires to use it for non-wine beverages. [See Shach 137:16 on Michaber 137:4 that even if one plans to use it for non-wine beverages, it may not be used “Derech Keva” until it is properly Kashered, as rules Rama 121:5 regarding all non-Kosher vessels, and the proper Kashering for a glass vessel is Shichshuch, as rules Michaber 135:1; See Imrei Eish Y.D. 44; Darkei Teshuvah 137:11]
 Rama ibid; Mordechai in name of Rabbeinu Tam; See Shach 122:8; Taz 122:7
 See Michaber 119:7 that such a Jew is like a gentile for all matters and is hence Chashud for everything; See also Michaber Y.D. 2:5 and Admur Shechita 2:10; Regarding a Jew who keeps Shabbos but eats non-Kosher: See Michaber 119:3 that one who is Chashud to eat Treif is not Chashud to steal Treif; See Rama 1181 and Shach 118:16
 The reason: As many Poskim hold a Michalel Shabbos of today does not make wine Yayin Nesech.
 Heard from Harav Yaakov Yosef z”l
 The reason: This is not similar to the case mentioned above where the gentile did not have permission to use the vessels as he wishes, in contrast to here where the gentile has become a temporary owner of the vessels and was able to use it for whatever he wishes. It is thus no different than purchasing a vessel from a gentile, in which the law is that it must be Koshered.
 Heard from Harav Yaakov Yosef z”l
 Heard from Harav Yaakov Yosef z”l
 See Koveitz Or Yisrael 65 pp. 61-70; and Netiv Hachalv and Sefer Ohel Yaakov Yichud p. 146