May someone put on Tefillin onto another person or must he personally put it on?[1]
It is permitted to place Tefillin, tighten and wrap it, onto another person’s arm and the person who is having it placed on him may say the blessing.[2]
Women/child/gentile:[3] It is even permitted for a woman, child, and even a gentile to put the Tefillin on him and have him say the blessing.
[1] Opinion in Hagahos Maimanis Tzitzis 1:9; M”B 27:6 [does not say not to say blessing]; Chochmas Shlomo 1; Maharam Shick 15; Maharshag 2:120; Mahariy Asad 19; Machaneh Chaim 6; Tzafnas Paneiach Rambam Tefillin; Miaseif Lechol Hamachanos 27:7; Kaf Hachaim 27:18; Igros Kodesh 29:92 [Published in Shulchan Menachem 1:80]; Minchas Shlomo 2:4; Beir Moshe 4:6; Tzitz Eliezer 13:7; Yabia Omer 9:90; See Piskeiy Teshuvos 27:3 footnote 16
[2] The reason: As a) Perhaps the main part of the Mitzvah is the wearing on the body. [See Ketzos Hachoshen C.M. 182:1; Igros Kodesh ibid] B) Even if the main part of the Mitzvah is the tightening, in this case one is helping him tighten the Tefillin, and one who helps is considered as if he is doing the action, as stated in Michaber Y.D. 181:3 regarding Nikuf. [Rebbe ibid; Tzafnas Paneiach Rambam Tefillin]
[3] Opinion in Hagahos Maimanis Tzitzis 1:9; Mahariy Asad 19; Maharam Shick 15; Machaneh Chaim 6; Poskim in Piskeiy Teshuvos 27:3 footnote 16
Other opinions: Some Poskim rule it is invalid to have a woman, child or gentile put the Tefillin on the person. [Opinion in Hagahos Maimanis Tzitzis 1:9; Poskim in Piskeiy Teshuvos 27:3 footnote 17]
