What is karet (being cut off), and what does Genesis 17:14's use of it reveal about non-circumcision?

Karet is the severest biblical penalty -- being cut off from the people, understood as spiritual excision from the covenant community. Its application to non-circumcision places it in the same category as the most fundamental covenant violations, not a minor omission.

How does the Exodus 4:24-26 episode with Moses and Zipporah reinforce the commandment's non-negotiability?

God seeks to kill Moses on the way to Egypt because his son is uncircumcised. Even the greatest prophet, appointed to lead Israel's redemption, is not exempt from the covenant sign. Zipporah's hasty circumcision of the child resolves the crisis -- the episode makes clear that leadership status provides no waiver from the most foundational covenant obligation.

Commandment #177 · Positive · Family Laws

This Is My Covenant Which You Shall Keep: Brit Milah

Q: Why does Genesis 17:10 call circumcision 'my covenant' rather than 'a sign of the covenant'?

The identification of the sign with the covenant itself signals that circumcision is not merely symbolic but constitutive -- to bear the mark is to be in the covenant; to refuse it is to be outside it. The sign so thoroughly represents the whole relationship that it is named for it.

Q: Why does circumcision override the Shabbat when the eighth day falls on Saturday?

The Talmud (Shabbat 132a) rules that the Torah's specific eighth-day timing takes precedence over Shabbat restrictions -- the only commandment with this priority. The logic is that a commandment tied to a fixed covenantal moment cannot be deferred to a more convenient day without altering its nature.

Q: What significance do commentators find in the eighth-day timing?

Seven days correspond to the creation week; the eighth day begins the next cycle. A child circumcised on the eighth day has passed through one full week of created existence before being marked as a covenant member. Some commentators note the child has also experienced at least one Shabbat -- the day of divine rest -- before entering the covenant.

בְּרִית מִילָה

Source: Genesis 17:10 · Maimonides, Sefer HaMitzvot, Positive #215

Genesis 17:10 calls circumcision not 'a sign of the covenant' but 'my covenant': the sign so thoroughly represents the whole that it is named for it. Every male must be circumcised — on the eighth day (Leviticus 12:3). Genesis 17:11 names the location: 'in the flesh of your foreskins.' Genesis 17:14 names the penalty for non-compliance: karet — being cut off from the people. The eighth-day timing overrides Shabbat (Shabbat 132a), the only commandment with this status.

This Is My Covenant Which You Shall Keep

זֹאת בְּרִיתִי אֲשֶׁר תִּשְׁמְרוּ בֵּינִי וּבֵינֵיכֶם וּבֵין זַרְעֲךָ אַחֲרֶיךָ הִמּוֹל לָכֶם כָּל זָכָר

"This is my covenant, which you shall keep, between me and you and your offspring after you: Every male among you shall be circumcised."

Genesis 17:10 — Open in Torah Reader

Genesis 17:10 is the founding statement of brit milah, circumcision as covenant sign. The phrasing is precise: 'This is my covenant which you shall keep.' Circumcision is not one commandment among many but 'the covenant' itself — the sign that marks an Israelite male as party to the Abrahamic covenant. Verse 11 (Genesis 17:11) names the location: 'You shall be circumcised in the flesh of your foreskins, and it shall be a sign of the covenant between me and you.'

Verse 14 (Genesis 17:14) states the consequence of non-compliance: 'Any uncircumcised male who is not circumcised in the flesh of his foreskin shall be cut off from his people; he has broken my covenant.' The penalty — karet, being cut off — is the severest category in biblical law, indicating that circumcision is not an optional ethnic practice but the foundational membership rite of the covenant people.

On the Eighth Day and Its Exceptions

Leviticus 12:3 (Leviticus 12:3): 'On the eighth day the flesh of his foreskin shall be circumcised.' The timing is precise: not the first day, not when the child seems ready, but specifically the eighth day after birth. The Talmud (Shabbat 132a) rules that this timing is so fixed that the circumcision overrides the Shabbat when the eighth day falls on Saturday — the only commandment with this status.

The eighth day has long attracted comment. Seven days correspond to the week of creation; the eighth day is the first day of a new cycle. A child circumcised on the eighth day has, in this reading, passed through a full week of created life before being marked as a covenant member — entering the covenant as a participant in creation. Maimonides (Guide 3:49) observes that the eighth-day timing is also medically opportune: the child is stable enough to undergo the procedure without danger.

Key Figures

Abraham at Ninety-Nine

Genesis 17:1–27 (Genesis 17) records God's covenant declaration and Abraham's immediate compliance: 'On that very day Abraham and his son Ishmael were circumcised, and all the men of his household' (17:26). Abraham does not wait; he circumcises himself and every male in his household the same day. His total response to the covenant sign sets the standard the commandment requires.

Moses and the Uncircumcised Son

Exodus 4:24–26 (Exodus 4) records one of the Torah's most mysterious episodes: God seeks to kill Moses on the way back to Egypt because one of his sons is uncircumcised. Zipporah, Moses's wife, circumcises the child herself and touches Moses with the foreskin, saying 'a bridegroom of blood.' Even the man appointed to lead Israel out of Egypt is not exempt from the covenant obligation — the sign is non-negotiable.

Study Questions

For reflection and group study

Why does Genesis 17:10 call circumcision "my covenant" rather than "a sign of the covenant" — and what does that identification reveal about the rite's significance?

What is karet (being cut off), and what does its appearance in Genesis 17:14 reveal about how seriously the Torah treats non-circumcision?

Why does circumcision override the Shabbat when the eighth day falls on Saturday (Shabbat 132a), and what does that ruling imply about the commandment's priority?

What significance do commentators find in the eighth-day timing — specifically the number eight as representing something beyond the seven-day cycle of creation?

How does the Exodus 4:24-26 episode with Moses and Zipporah reinforce that even exceptional leadership does not exempt a family from the covenant obligation?

Read the full passage in the Torah reader.

Open Genesis 17 in the Bible Reader

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