The argument deserves to be stated in its strongest form. Genesis 17 does not present circumcision as a local custom, a mere ethnic marker, or a later rabbinic preference. It places circumcision at the center of God's covenant with Abraham:

"You shall keep My covenant, you and your offspring after you throughout their generations. This is My covenant, which you shall keep, between Me and you and your offspring after you: every male among you shall be circumcised... So shall My covenant be in your flesh as an everlasting covenant. Any uncircumcised male... shall be cut off from his people; he has broken My covenant." Gen 17:9-14

On the face of the passage, the proponent's case is powerful. The text calls circumcision an ot berit, a "sign of the covenant," and then intensifies the point: the covenant is to be "in your flesh" as a berit olam, an "everlasting covenant." The uncircumcised male is not described merely as missing a symbol. He has "broken My covenant" and is liable to being "cut off" - Hebrew venikhretah, the language later associated with karet.

Within classical Judaism, this reading is not marginal. Rashi takes Genesis 17:14 straightforwardly: the uncircumcised male who reaches responsibility and refuses circumcision is liable to excision. Mishnah Keritot 1:1 lists neglect of circumcision, along with the Passover offering, among the positive commandments whose deliberate neglect entails karet. Mishnah Nedarim 3:11 speaks in unusually elevated terms about circumcision, saying that it is so weighty that "thirteen covenants were made concerning it" in Genesis 17. The Talmud treats circumcision as so central that, when performed on the eighth day, it overrides Shabbat. Rambam codifies the obligation in Mishneh Torah, Hilkhot Milah, and later halakhah continues to regard brit milah as a defining covenantal commandment for Jewish males.

Nor is this only rabbinic amplification. The Tanakh itself continues to assume the force of the command. Exodus 12:48 requires circumcision for a foreigner who would join Israel in offering the Passover. Joshua 5 depicts Israel's entry into the land as requiring a renewal of the practice: the males born during the wilderness period had not been circumcised, so Joshua circumcises them before Israel keeps Passover at Gilgal. Jeremiah 9:25-26 (MT 9:24-25) is more complex than a simple slogan; it places Judah among peoples facing judgment and says that Israel is "uncircumcised in heart." That is a prophetic indictment of covenant hypocrisy, not a repeal of bodily circumcision. Ezekiel 44:7-9 excludes those "uncircumcised in heart and uncircumcised in flesh" from the sanctuary. The prophetic demand for inner covenant fidelity does not erase the fleshly sign.

Why the argument is strong

The strongest form of the argument rests on several textual observations.

  • Genesis 17 ties the covenant sign to the body. The requirement is not stated only in moral or spiritual terms. "You shall circumcise the flesh of your foreskins" is concrete, bodily language.
  • The command is generational. The phrase "throughout their generations" resists the idea that circumcision was only for Abraham's immediate household.
  • The covenant is called everlasting. While the Hebrew olam can sometimes mean a long or indefinite duration rather than metaphysical eternity, in Genesis 17 the surrounding phrases - "throughout their generations" and "in your flesh" - make the duration weighty.
  • Failure is covenant-breaking. Genesis 17:14 does not say only that the uncircumcised male lacks a badge. It says, "he has broken My covenant."
  • Later biblical texts do not clearly revoke the command. The Torah, Former Prophets, and Latter Prophets continue to treat circumcision as part of Israel's covenantal life.

For these reasons, if a later teacher says to Jewish males within Israel's covenant - whether born Jewish or entering by conversion - "circumcision is no longer covenantally required," the Jewish objection is textually serious. It is not a mere appeal to custom. It rests on the plain language of Genesis 17 and on the way the command functions throughout the Tanakh and halakhic tradition.

The strongest reply

The strongest reply is not to deny the plain force of Genesis 17. It is to ask more carefully what, and whom, Genesis 17 obligates.

First, Genesis 17 is not a generic command to all humanity. It is addressed to Abraham, his seed, and the males of his household: "every male among you," including those "born in your house" and those "bought with your money from any foreigner who is not of your offspring." The scope is covenantal and household-based. It is broader than biological descent alone, since slaves and household members are included. But it is not presented as a universal Noahide command for every nation as such.

Rabbinic tradition preserves this distinction. Gentiles are not generally obligated in circumcision simply by virtue of being human; circumcision is not part of the standard rabbinic list of the seven Noahide laws. Under classical halakhah, a male convert to Judaism must undergo circumcision, and Exodus 12:48 requires circumcision for the foreigner who would participate in the Passover. Rabbinic sources also discuss Abrahamic descendants outside Israel in narrower ways, but that is not the same as a universal command to all nations. A non-Jew who honors the God of Israel without entering Israel's covenant is not thereby automatically treated in halakhah as liable to the command of brit milah. This distinction matters. The Tanakh can require circumcision for Abraham's covenant household while not requiring every Gentile who acknowledges Israel's God to be circumcised.

Second, Genesis itself shows that Abraham's relationship with God is not reducible to circumcision. In Genesis 15:6, before the command of circumcision, Abraham "believed the LORD, and He accounted it to him as righteousness." Genesis 18:19 describes Abraham's calling in moral terms: he is to command his children and household after him "to keep the way of the LORD by doing righteousness and justice." The covenant sign is indispensable for Abraham's household, but it is not the whole content of covenant faithfulness.

This is also the meaning of the prophetic and Deuteronomic language about the heart. Deuteronomy 10:16 commands Israel, "Circumcise the foreskin of your heart," and Deuteronomy 30:6 promises that God will circumcise Israel's heart. Jeremiah 4:4 likewise calls Judah to "circumcise yourselves to the LORD; remove the foreskins of your heart." These texts do not abolish bodily circumcision. Rather, they warn that bodily circumcision without covenant obedience is inadequate. The reply, then, can rightly say that "faith" and inner transformation are biblical categories. But it cannot honestly make them replacements for the bodily sign where the bodily sign is commanded.

Third, the phrase "everlasting covenant" must be handled carefully. Hebrew olam can, in some contexts, mark an indefinite or age-long duration rather than philosophical endlessness in the abstract. Exodus 21:6 says that the ear-pierced slave serves his master "forever"; classical Jewish interpretation reads that service in light of the Jubilee legislation rather than as literally endless slavery. Likewise, some priestly and cultic statutes are called "everlasting" even though, after the destruction of the Temple, Jewish law treats many of their concrete performances as suspended until the required sanctuary conditions exist, not as casually abolished.

Still, this observation should not be overstated. In Genesis 17, berit olam is not a weak phrase. It means that circumcision is not temporary within the covenantal order being established. Appeals to the flexibility of olam may explain how Jewish tradition thinks about commandments under disrupted historical conditions, but they do not by themselves authorize annulling circumcision for Jewish males.

Joshua and the prophets

Joshua 5 is especially important because it shows both lapse and continuity. The wilderness generation had not circumcised their sons. On entering the land, Joshua is commanded to circumcise Israel again. The episode is not treated as proof that the command had expired during the wilderness. Rather, the neglect is remedied before Israel celebrates Passover in the land.

This is a strong internal precedent: even a long period of nonobservance does not cancel the covenantal sign. It must be restored.

The prophets reinforce the same pattern. Jeremiah rebukes Judah by placing it under judgment alongside neighboring nations and by saying that Israel is "uncircumcised in heart"; the force of the rebuke depends on bodily circumcision not being enough. Ezekiel can require both circumcision of heart and circumcision of flesh for sanctuary access. The critique is not "fleshly circumcision no longer matters." It is "fleshly circumcision without obedience does not suffice."

Jeremiah 31, often discussed because it speaks of a "new covenant," also does not explicitly repeal circumcision. The new covenant is made "with the house of Israel and the house of Judah," and its central promise is that God's Torah or instruction will be written on the heart, with forgiveness of sin. The continuation of the chapter is also important: Jeremiah 31:35-37 grounds Israel's ongoing status before God in the fixed order of sun, moon, and stars, and says Israel's seed would cease from being a nation before Him only if that order could be overturned. That is strong evidence for the traditional Jewish reading: the "new covenant" is renewal and internalization for Israel and Judah, not an explicit cancellation of the Abrahamic sign or a transfer away from Israel. It is not, by itself, a circumcision text, but it gives no textual warrant for repealing circumcision.

What the argument establishes

The argument establishes a great deal.

  • It establishes that circumcision is not optional for Jewish males within the Abrahamic-Israelite covenant. Genesis 17, Exodus 12, Joshua 5, and later Jewish law all support this conclusion.
  • It establishes that "inner faith" alone is not a substitute for the commanded sign. The Tanakh demands both covenant loyalty of the heart and obedience in embodied practice.
  • It establishes that a teaching which abolishes circumcision for Jews stands in severe tension with the plain sense of the Torah. A Jewish reader has strong grounds to object to such a teaching as contradicting Genesis 17.
  • It establishes that later covenant language must be read in continuity with Abraham unless a clear textual warrant for repeal is given. The Tanakh provides no obvious repeal.

What it does not establish

But the argument also has limits.

  • It does not establish that every Gentile must be circumcised. Genesis 17 obligates Abraham's household and seed; Exodus 12 obligates the foreigner who joins Israel's Passover. That is not the same as a universal command to all nations.
  • It does not prove that circumcision alone guarantees covenant standing. The prophets repeatedly deny that outward signs without righteousness can protect Israel from judgment.
  • It does not settle every later theological claim about covenant membership. It does, however, set a high burden of proof for anyone claiming that the Torah's explicit command has been annulled.
  • It does not make repentance impossible for the uncircumcised. Joshua 5 shows restoration after neglect; rabbinic law also treats the uncircumcised adult as obligated to correct his condition.

A plain conclusion

On the Tanakh's own terms, circumcision is the enduring bodily sign of God's covenant with Abraham and his covenant household. Classical Jewish interpretation is well grounded when it insists that brit milah remains binding on Jewish males and on male converts entering Israel's covenant.

The best reply is not that circumcision was merely symbolic, nor that inward religion cancels the fleshly command. Those replies are too weak for Genesis 17. The better distinction is one of scope: the Torah binds Abraham's covenant household to circumcision, and classical Jewish law applies the ongoing obligation to Jews and male converts; it does not plainly impose circumcision on every Gentile who honors Israel's God without entering Israel's covenant.

Therefore, to the extent a later message tells Jews that they need not circumcise their sons, it conflicts sharply with Genesis 17 and with the mainstream Jewish reading of the covenant. A message that says Gentiles need not become circumcised unless they enter Israel as covenant members is a different claim, and Genesis 17 alone does not refute that narrower Gentile claim. The central point remains: for Israel, circumcision is not an expendable ritual. It is the covenant in the flesh.