The term “avunculate marriage” refers to marriage between a man and his niece. In this paper, we will explore the Bible’s view on the permissibility of such unions, and discuss several examples of such marriages in the Bible. Not only does rabbinic literature generally presume that such marriages are permitted, the Talmud even encourages it. On the other hand, other sources ban these relationships. The Sadducees believe that the Bible forbids such marriages. While various Tosafists believe that such marriages are Biblically permitted, they still prohibit marrying one’s niece (at least in some cases) for other reasons.

Abraham & Nahor marry their nieces

Upon close examination, one will find that at least six Biblical personalities married their nieces. Each of these cases can and are interpreted in various ways; calling into question their relevance to our discussion. However, the mere fact that tradition allows for these sorts of interpretations shows that avunculate marriage is compatible with Biblical tradition, and constitutes a legitimate building block in the institution of the Jewish family.

The first two examples of avunculate marriages in the Bible are those between Abraham and Nahor and their respective nieces. The Torah says:

And Terah lived seventy years, and begot Abram, Nahor, and Haran. Now these are the generations of Terah: Terah begot Abram, Nahor, and Haran; and Haran begot Lot. And Haran died in the presence of his father Terah in the land of his nativity, in Ur of the Chaldees. And Abram and Nahor took them wives: the name of Abram’s wife was Sarai; and the name of Nahor’s wife, Milcah, the daughter of Haran, the father of Milcah, and the father of Iscah. (Gen. 11:26–29)

This passage records that Abram (i.e. Abraham), Nahor, and Haran were brothers. Nahor married Milcah, the daughter of Haran; and Abraham married Sarai. According to an ancient tradition preserved in rabbinic sources (Seder Olam Ch. 2; TB Megillah 14a; and TB Sanhedrin 69b) and by Josephus (Antiquities of the Jews Book I, Ch. 6), another name for Sarai is Iscah. The assertion that Sarai is the same person as Iscah is supported by the fact that the Torah provides the paternity of Nahor’s wife Milcah, yet does not mention the paternity of Abraham’s wife Sarai. Given that the Torah delineates one wife’s father, we would have expected it to mention the father of the other wife as well. This difficulty can be resolved if we assume that Sarai is Iscah, since the Torah states that Haran was the father of Iscah.[1]

If we assume that the Haran who is mentioned as Abraham and Nahor’s father-in-law is the same person as their brother Haran, and that Sarai is Iscah, then this passage records two instances of avunculate marriages: Nahor married his niece Milcah and Abraham married his niece Iscah/Sarai. However, it is debatable whether Nahor and Abraham’s marriages to Milcah and Sarai were truly avunculate marriages. In order to claim that they were, one must rely on two assumptions, both of which are subject to dispute. Firstly, Ibn Ezra (to Gen. 11:29) expresses skepticism regarding the identification of Iscah with Sarai.[2] Secondly, even if Iscah is Sarai, some commentators (including Abarbanel(Gen. 11) and the Medieval work Moshav Zeqenim[3]) understand that the Bible refers to two different men named Haran. One was a brother to Abraham and Nahor (and father of Lot); while the other was the father of Iscah/Sarai and Milcah.[4] Accordingly, there is no clear consensus on whether Abraham and Nahor married their nieces.

Amram had three children: Miriam, Aaron, and Moses. The Bible records the marriages of both of Amram’s sons: Moses married Zippora daughter of Jethro (Ex. 2:21), and Aaron married Eliseba daughter of Amminadab (Ex. 6:23). However, the Bible does not tell us about the family of Amram’s daughter Miriam.

Rabbinic literature states that she married Caleb (Exodus Rabbah §1:17; Sifrei, Beha’alothkha §78; and TB Sotah 11b–12a). However, according to the apocryphal work The Testament of Amram found amongst the Dead Sea Scrolls at Qumran (4Q543, 4Q549), Amram gave his daughter Miriam to his younger brother Uzziel to wed. That work understands that the sons of Uzziel listed in the Bible (Ex. 6:22) were born to his wife Miriam. Thus, that work believed that Uzziel married his brother’s daughter Miriam.

There is a Talmudic discussion (TB Bava Bathra 91a) regarding the Book of Ruth which explains the relationships between its major players. It asserts that Elimelech (Naomi’s husband), Salmon (Boaz’s father), the anonymous relative who refused to redeem Naomi’s field, and Naomi’s father were all sons of Nahshon ben Amminadab. According to this understanding, Elimelech married his brother’s daughter—Naomi.

However, the Midrash (Ruth Rabbah §6:3) presents a dissenting view that Elimelech was a son of Salmon (and brother to Boaz). According to this understanding, Naomi was not Elimelech’s niece but his first cousin.

However, the Tosafists (Tosafot to TB Yevamot 62b) quote in the name of Rashi’s grandson Rashbam that the Talmud’s endorsement also applies to one’s fraternal niece, not just to a sororal niece. He explains that the Talmud specifically mentions marrying a sororal niece simply because it is more common that a man’s sister will convince him to marry her daughter than it is for his brother to do so.

Nonetheless, Rabbeinu Tam disagrees with this assertion and instead maintains that the Talmud only means that one should marry his sororal niece. There are two modes of justifications given for this approach: Firstly, one’s sororal niece is similar to her uncle, as the Rabbis say, “Most children are similar to the brothers of their mother” (TB Baba Bathra 110a, Sofrim 15:10). This similarity between the two will ensure a stronger marriage, and that is precisely what the Talmud means to endorse.

Rabbinic Judaism extends the meanings of the Biblical passages (Lev. 18 and 20) which delineate forbidden relationships. They note that the Torah spoke of the incest laws from the man’s point of reference, but the laws apply equally to a woman. Thus, the Rabbis understand that all incestuous relationships mentioned in the Bible are forbidden to both the man and the woman involved (TB Yevamot 84b). However, the Rabbis do not add more forbidden relationships than those listed by the Bible; they only say that both parties are culpable. The Sadducees, on the other hand, add cases to the Bible’s list and forbid more cases of the same types of relationship. In this, the Rabbis understand the Bible’s meaning differently than the Sadducees and remain more faithful to the text of the Torah than did they.

The Sadducean method of interpretation creates three pairs of redundancies in the Bible’s list (Cases 3, 7, 8, 9, 11, and 12) and also creates four new cases of incest which are not mentioned in the Bible, in addition to marrying one’s niece (Cases 4, 6, two scenarios, 10).

These two points demonstrate the weakness of the Sadducean approach. The method of interpretation used to justify including one’s niece in the Biblical prohibition against marrying one’s aunt would create a series of redundancies in the other listed cases of incest. Furthermore, according to the Sadducean methodology of Biblical interpretation, four other relationships should be classified as incestuous (in addition to marrying one’s niece). However, the Sadducees are inconsistent in that they explicitly mention their added prohibition against marrying one’s niece but fail to account for the other new cases of incest which their methodology creates.[20]

The 12th century German leader of the Hassidei Ashkenaz movement, R. Judah Ha-Hassid, declares that one should not marry his niece, neither sororal nor fraternal (in his ethical will §22 and in Sefer Hassidim §477). However, his understanding of this prohibition clearly differs from the Sadducean approach. The Sadducees understood that the Bible itself prohibits marrying one’s niece, while Ha-Hassid does not. As a follower of Rabbinic tradition, Ha-Hassid must comply with Talmudic law, yet his mention of a prohibition against marrying one’s niece is clearly at odds with the Rabbinic approach which not only allows for such marriage but even encourages it.

R. Ezekiel Landau of Prague (1713–1793), in his halachik responsa (Noda B’Yehuda, Even HaEzer Tinyana §79), offers an innovative solution. He proves that R. Judah Ha-Hassid only wrote the prohibitions in his will and Sefer Hassidim for his descendants—not for all Jews—because otherwise his prohibition would contradict an explicit Talmudic passage that not only allows but even applauds a man marrying his niece. [24] Others interpret Ha-Hassid’s warning in accordance with contemporary science, which warns of the genetic dangers to children born to an uncle and niece.

There are essentially two general views regarding avunculate marriage in the Bible. The Rabbinic position is that avunculate marriage is permitted by Biblical law. In fact, according to Rabbinic tradition, there are even Biblical precedents for allowing such marriages. Nonetheless, the Rabbis do limit the circumstances under which one may marry his niece. They forbid marrying one’s fraternal niece, since this might interfere with the commandment of the Levirate marriage. There is also the pietistic view of the Hassidei Ashkenaz, who rule that only a pious man may marry his niece (because he will have pure intentions), while the masses should not engage in such unions.

By contrast, the Sadducean approach outlaws avunculate marriage entirely, and attributes this prohibition to the Bible. Even according to Rabbinic tradition, the aforementioned Biblical cases are not unanimously viewed as actually consisting of avunculate marriages. The Sadducees would likely interpret these cases such that they do not serve as precedents for legitimately marrying one’s niece.

R. Saadya Gaon
In response to Qaraite scholars, R. Saadya Gaon (882-942) addresses the topic
of the identification of the birds of the Torah in his writings[19],
delivering anti-sectarian polemics.

Dr. Bernard Revel proved in his “תרגום יונתן על
התורה” (here) that the Targum Yonathan (ben
Uziel) was really an early ninth century targum commissioned by the Torah sages
of Eretz Yisroel. He demonstrated that this targum is filled with views of the
Talmud Yerushalmi as well as interpretations aimed at countering sectarian
movements. (here)

Byzantium 

Rambam lived at the end of the Qaraite Golden Age. He observed many Rabbanites
leave the fold for Qaraism and a weakened respect for the Oral Torah in the
Rabbanite community[33].
Witnessing Qaraites begin to consume many birds eaten by the Rabbanite
community, Rambam feared that his followers would be influenced by Qaraite
meat/poultry and milk cooking practices. He tightened baasar be’cholov
laws – a process begun a century earlier by R. Chananel – by requiring a six
hour wait for poultry as well.