In ancient times, tribal nations preferred
endogamous marriage – marriage to one's relatives;[1] the ideal marriage was usually that to a cousin, and it was often forbidden for an eldest daughter to even marry outside the family.[1] Marriage to a half-sister, for example, is considered
incest by most nations today, but was common behaviour for Egyptian
pharaohs; similarly, the Book of Genesis portrays
Sarah as marrying
Abraham, her half-brother, without criticising the close genetic relationship between them,[2] and the
Book of Samuel treats the marriage of a royal prince to his half-sister as unusual, rather than wicked.[1]
Instances
The Bible mentions a number of sexual relationships between close kin, most of which relate to the pre-Sinai period, before the handing down of the
Mosaic law:
In
Genesis 9:20–27,
Ham saw his father
Noah's nakedness. The
Talmud suggests that Ham may have
sodomized Noah (Babylonian Talmud
Sanhedrin 70a). In more recent times, some scholars have suggested that Ham may have had intercourse with his father's wife.[3]
Abraham's brother
Nahor married his niece
Milcah, the daughter of his other brother
Haran.[4]
Living in an isolated area after the destruction of
Sodom and Gomorrah,
Lot's
two daughters conspired to inebriate and seduce their father due to the lack of available partners.[5] Because of intoxication, Lot "perceived not" when his firstborn, and the following night his younger daughter, lay with him. (
Genesis 19:32–35) The two children born were directly Lot's sons and indirectly his grandsons, being his daughters' sons. Likewise, their sons were also half-brothers (between them and with their mothers), having the same father, as well as cousins, having mothers that were sisters.[6]
Marriage of cousins was common in the pre-Sinai period. Abraham's son
Isaac married
Rebekah, his first cousin once removed, the granddaughter of his father Abraham's brother Nahor with Milcah.[7]
Isaac and Rebekah's firstborn son
Esau resorted to marrying his cousin Mahalath, daughter of his father's brother
Ishmael because his parents didn't approve of him having relationships with Canaanites.[8]
Isaac and Rebekah's second son
Jacob married his cousins
Leah and
Rachel, who were daughters of his mother's brother
Laban.[9] Leah and Rachel were sisters; a wife's sister is also forbidden.
Jacob's firstborn son
Reuben had sex with his father's concubine
Bilhah.[10]
Judah, Jacob's fourth son, mistook his daughter-in-law
Tamar for a
prostitute while she was veiled, and had sex with her.[11]
Amnon,
King David's eldest son and
heir to the throne, raped his half-sister
Tamar. Tamar's brother,
Absalom, learned of the incident and, two years later, ordered his servants to have Amnon killed.[14] In vain with Amnon, Tamar said, "Now therefore, I pray thee, speak unto the king; for he will not withhold me from thee".[15]
Absalom, son of King David, in the middle of a rebellion against his father, had sex with his father's
concubines on the roof inside a tent.[16]
Zelophehad's daughters, Mahlah, Tirzah, Hoglah, Milcah, and Noah, married their cousins on their father's side to obey the Lord's command. The Lord said: "no inheritance shall be transferred from one tribe to another".[21][22]
Caleb said, "I will give my daughter Acsah in marriage to the one who attacks and captures Kiriath-sepher." Othniel, the son of Caleb's brother Kenaz, was the one who conquered it, so Acsah became Othniel's wife.[23]
Prohibited relationships
Leviticus 18:7–11 and
20:11–21 sets out lists of prohibited relationships, and two chapters later specifies punishments for such unions, but the second list of unions is much shorter than the first.
Critical scholars regard the lists as having originally been independent documents, bound together at a later point.[24][25][26] The
Deuteronomic Code gives a yet more simple list of prohibited relationships – a man's parent's daughter (including his sister), a man's father's wife (including his mother), and a man's mother-in-law.[27][28] In the
Hebrew Bible, sexual relationships between siblings are forbidden to Jews but permissible to
Gentiles (non-Jews).[29]
One of the most notable features of each list is that sexual relations between a man and his own daughter is not explicitly prohibited. Although the first relation mentioned after the Levitical prohibition of sex with "near kin" names that of "thy father",[30] it must be taken into account that the Hebrew original text only addresses male Jews with regard to their female relatives.[31] The Talmud argues that the absence is because the prohibition was obvious, especially given the proscription against a relationship with a granddaughter,[32] although some
biblical scholars have instead proposed that it was originally in the list, but was then accidentally left out from the copy on which modern versions of the text ultimately depend, due to a mistake by the scribe.[33] The second list in the Holiness code noticeably differs from the first by not including the closer relatives, and it might be assumed that obviousness is the explanation here as well.[1] One might argue that the explicit prohibition against engaging in sexual activity with a woman as well as with her daughter,[34] implicitly forbids sexual activity between a man and his daughter. However, the rationale might suggest otherwise (the original text is unclear here), since it mentions only that "they" (i.e., the woman and the daughter) are related.[35]John Calvin did not consider the father-daughter-relation to be explicitly forbidden by the Bible, but regarded it as immoral nevertheless.[36]
Apart from the case of the daughter, the first incest list in Leviticus roughly produces the same rules as applied in early (pre-Islamic) Arabic culture;[1] in
Islam, these pre-Islamic rules were made statutory.[33]
Ezekiel implies[33] that, in his time, marriage between a man and his stepmother, or his daughter-in-law, or his sister, were frequent.[37] This situation seems to be the target of the Deuteronomic version of the incest prohibition, which only addresses roughly the same three issues[1][33] (though prohibiting the mother-in-law in place of the daughter-in-law). Early rabbinic commentators instead argue that the Deuteronomic list is so short because the other possible liaisons were obviously prohibited, and these three were the only liaisons difficult to detect, on account of the fact that, in their day, a man's stepmother, half-sister, and mother-in-law usually lived in the same house as the man (prior to any liaison).[38]
Also, cousins are not included in the lists of prohibited relationships. It is not considered incestuous.
Sex-specific rules
The biblical lists are not symmetrical – the implied rules for women are not the same – they compare as follows:
Forbidden for men only
Forbidden for women only
Forbidden for both men and women
Leviticus 18
Leviticus 20
Deuteronomy
Grandparent's spouse (including other grandparent)
^Frederick W. Bassett, "Noah's nakedness and the curse of Canaan: a case of incest?" VT 21 [1971] pp. 232–237. John S. Bergsma and Scott Hahn, "Noah's nakedness and the curse on Canaan (Genesis 9:20–27)," JBL 124 [2005] pp. 25–40.