Mishneh Torah, Forbidden Intercourse 12-14

Sugya Map

• Primary Issue: The scope and source of the prohibition against intermarriage (issur chattan) between Jews and non-Jews.
• Nafka Minot:
  • Does the prohibition extend beyond the Seven Canaanite Nations to all non-Jews?
  • Is the prohibition strictly marital, or does it include licentious relations (bi'ah)?
  • Does the status of gerut (conversion) resolve the issur, or do specific national prohibitions (Ammon, Moab, Egypt, Edom) persist?
• Primary Sources:
  • Deuteronomy 7:3 ("You shall not intermarry with them").
  • Kiddushin 68b (The debate between R. Shimon and the Sages regarding "For he shall sway your son").
  • Nehemiah 10:31 (The post-exilic expansion of the prohibition).
  • Avodah Zarah 36b (The Hasmonean decree against licentious relations).

Text Snapshot

• Hilchot Issurei Biah 12:1: "When a Jew engages in relations with a woman from other nations, [taking her] as his spouse... they are punished by lashes, according to Scriptural Law... As [Deuteronomy 7:3] states: 'You shall not intermarry with them.'"
• Nuance: Rambam’s use of "as his spouse" (derek ishut) is intentional. He adopts the position that the Scriptural prohibition is predicated on the creation of a marital bond, which, according to his meta-halachic framework, cannot exist between a Jew and a non-Jew (see Hilchot Ishut 4:15).

Readings

The Rambam and the Expansionist Exegesis

Rambam’s central chiddush in 12:1 is the universalization of the prohibition of intermarriage. While the verse in Deuteronomy explicitly names the seven nations of Canaan, Rambam rules, following the opinion of Rabbi Shimon in Kiddushin 68b, that the phrase "for he shall sway your son" (ki yasir et bincha) functions as a rationale that transcends the specific geographic limitations of the Canaanites. By framing the prohibition as a preventative measure against religious erosion, Rambam classifies all non-Jews as included in the Scriptural prohibition.

The Tur (Even HaEzer 16) vehemently disagrees, limiting the Deoraita prohibition to the seven nations. The Tur views the verse as a specific decree for a specific time and place. Rambam’s reliance on the Sheiltot of Rav Achai Gaon suggests a systemic understanding of the Torah's protective boundary: if the ta'am (rationale) is universal—the swaying of the heart—the halacha must be universal.

The Problem of the "Status" of the Non-Jew

A critical chiddush found in 12:16 is the principle that "among gentiles, the identity is determined by the male." This is the inverse of Jewish law, where the child’s status follows the mother. Rambam argues that once they convert, the offspring is assigned the status of the "lowest" (most restricted) parent. This chiddush is essential for the laws of Egyptian and Edomite converts. The complexity arises when these nations, post-Sennacherib’s exile, become effectively "mixed." Rambam’s pragmatic ruling—that in the present age, all converts are permitted—is a triumph of psak over theoretical stringency. He acknowledges the historical reality of the mass displacement of nations to declare the previous prohibitions functionally obsolete.

Friction

The Kushya: The "Marriage" Paradox

The strongest kushya against Rambam is the contradiction between his assertion that bi'ah with a non-Jew is a Scriptural prohibition and his concurrent ruling that there is no concept of marriage (kiddushin) between a Jew and a non-Jew. If marriage is impossible, how can the Torah command "you shall not intermarry" (lo titchaten bam)?

The Terutz

Rambam maintains that the lo titchaten prohibition is triggered specifically by the attempt to create a marital bond, even if that bond is legally invalid in the eyes of the Torah. The act of "taking" a gentile woman as a wife—even if the kiddushin is null—falls under the prohibition because the intent and the social structure of the act mimic marriage.

Furthermore, as the Maggid Mishneh notes, the Hasmonean decree (the gezeirah against bi'ah with a gentile woman even without marriage) was explicitly designed to plug the gap where the Scriptural law could not reach. By distinguishing between derek ishut (Scriptural) and bi'ah (Rabbinic), Rambam maintains a dual-layered defense system: the Torah forbids the formalization of the union, and the Rabbis forbade the physical act itself to prevent the slide toward that formalization.

Intertext

• Ezra 10:2: The narrative of the returnees to Zion separating from their "foreign wives" serves as the primary historical anchor for Rambam. It demonstrates that the prohibition was not merely a Canaanite-specific rule but a covenantal requirement for the preservation of the Jewish people in the face of assimilation.
• Yevamot 47b: The Talmudic discussion of the "difficulty of converts" mirrors Rambam’s skepticism in 13:17. Both sources suggest a deep-seated anxiety regarding the sincerity of conversion, yet both affirm that once the mikveh and brit are performed, the legal status of the convert is total and irrevocable.

Psak/Practice

In contemporary practice, the Rambam’s framing remains the bedrock of the geirut process. The "soft words" of the court, the warning regarding the severity of the mitzvot, and the requirement to check for ulterior motives (financial or romantic) are all reflections of 14:1–3.

Rambam’s meta-psak heuristic—that a convert who commits apostasy remains a Jew—is the defining principle of the gair who falls away. The status is not a revocable contract; it is an ontological change. This necessitates the requirement for a get (divorce) even for a convert who has abandoned the faith, as their marriage to another Jew remains legally binding.

Takeaway

Rambam transforms the specific Canaanite prohibition into a universal covenantal boundary, asserting that the integrity of Jewish lineage is protected not just by statute, but by a strategic, multi-layered Rabbinic system that treats the bi'ah of the gentile as a existential threat to the holiness of the seed of Israel.