Halachah 1 — Obligation of Women, Slaves, and Children
Women and slaves are obligated to recite Birkat HaMazon.
There is doubt whether their obligation is biblical (since it is not time‑bound) or rabbinic; therefore, they may not discharge the obligation of others.
Children are obligated by rabbinic decree, as part of their education in mitzvot.
Halachah 2 — Basic Requirement of Zimmun
When three people eat a meal with bread together, they are obligated to recite zimmun before grace.
The formula for three to nine people:
- Leader: “Let us bless Him of Whose bounty we have eaten.”
- Respondents: “Blessed be He of Whose bounty we have eaten and by Whose goodness we live.”
- Leader repeats the congregational response.
Halachah 3 — Transition from Zimmun to Grace
After zimmun, the leader continues immediately with Birkat HaMazon, and the others respond Amen after each blessing.
Halachah 4 — Zimmun with God’s Name
When ten or more people eat together, zimmun is recited with God’s Name.
The formula explicitly includes “our God”, and then the leader proceeds to grace.
Halachah 5 — Zimmun at a Wedding Feast
In the home of a bridegroom—from the start of wedding preparations until 30 days after the wedding—zimmun includes the phrase:
“In Whose abode is joy.”
If ten people are present, God’s Name is included.
For wedding feasts during the twelve‑month celebration period, this phrase is also included.
Halachah 6 — Universal Obligation of Men
All men obligated in grace are obligated in zimmun, including:
- priests eating sacrificial food,
- mixed groups of priests and Israelites.
Differences in food sanctity do not exempt one from zimmun.
Halachah 7 — Who May and May Not Join Zimmun
Women, servants, and minors:
- may not be counted together with men,
- may form their own zimmun,
- but without God’s Name.
For reasons of modesty, mixed groups of women, servants, and children together are discouraged.
Special cases:
- Androgynous → may form zimmun only with others like himself.
- Tumtum → may not join zimmun at all.
A minor who understands Whom we bless may join a zimmun (even of ten).
A gentile may never be included.
Halachah 8 — Minimum Eating Requirement
Only those who ate at least a k’zayit of bread may form a zimmun.
For a zimmun of ten:
- a clear majority (at least seven) must have eaten bread.
- those eating vegetables or brine may supplement the count only if this majority exists.
For a zimmun of three:
- all three must have eaten bread.
Halachah 9 — Late Arrival to the Meal
If two people finished eating and a third arrives:
- if the earlier diners can still eat something with him (even not bread), they may include him in zimmun.
The greatest scholar present should lead, even if he arrived last.
Halachah 10 — When Groups May Separate
Three to five people may not split without zimmun.
Six to ten may divide into two groups.
More than ten may not divide unless both resulting groups can each recite zimmun with the same formulation.
Halachah 11 — Individuals from Different Groups
If three people from different groups join together:
- and none already recited zimmun → they must recite zimmun together.
- if each already participated in a zimmun → they may separate.
People who sit together to eat may not separate even if each eats from his own food.
Halachah 12 — Visual or Auditory Connection Between Groups
Two groups eating in the same building may form a single zimmun if:
- they can see each other, or
- a single attendant serves both and all can hear the leader.
Halachah 13 — Leaving During the Meal
If one of three leaves to the marketplace:
- he may still be included if he can hear and respond to zimmun,
- afterward, he recites grace alone.
For a group of ten, zimmun may not be recited until all return.
Halachah 14 — One Who Recited Grace Early
If one of three recited grace early:
- the remaining two may perform zimmun with him post‑facto,
- but he himself does not fulfill his zimmun obligation retroactively.
Halachah 15 — Two People Eating Together
When two eat together, each recites grace individually.
If one does not know how:
- the knowledgeable one recites aloud,
- the other answers Amen and fulfills his obligation.
A son may recite for his father, a servant for his master, and a wife for her husband—
though the Sages strongly discouraged reliance on this.
Halachah 16 — Biblical vs. Rabbinic Obligation
When one ate:
- less than satisfaction → obligation rabbinic → he may fulfill it by listening to a woman, minor, or servant.
- to satisfaction → obligation biblical → only someone equally obligated biblically may discharge his duty.
Halachah 17 — Joining Zimmun in Progress
If one enters as zimmun begins:
- at “Let us bless” → he responds “Blessed is He and may He be blessed.”
- during the response → he answers Amen afterward.
Core Principle of the Chapter
Zimmun transforms Birkat HaMazon from an individual act of gratitude into a communal proclamation of God’s beneficence, governed by clear rules of participation, equality of obligation, and respect for structure.
