ভূমিকা
Shiavault - a Vault of Shia Islamic Books An Enlightening Commentary into the Light of the Holy Qur'an vol. 3 Section 3: Women who may be taken in wedlock Unlawful to wed blood and foster relations -Not to marry two sisters at a time -To marry free women - Laws regards wedding slave girls.
" Forbidden to you (in marriage) are your mothers, and your daughters, and your sisters, and your parental aunts and your maternal aunts, and daughters of your brother and daughters of your sister, and your mothers that have suckled you, and your foster sisters, and the mothers of your wives, and your step-daughters who are in your guardianship (born) of your wives to whom you have gone in, but if you have not gone in to them, there shall not be a sin on you (to marry their daughters), and the wives of your sons who are of your own loins.
And (it is forbidden to you) that you should have two sisters together (at the same time), except what has already passed, verily Allah is Forgiving, Merciful." In this verse, those women with whom marriage is forbidden are pointed out. This prohibition comes forth through three ways: Birth of progeny, genealogical relationship; marriage, (casual relationship); suckling, (foster relationship).
The marriages with the above mentioned relatives, which had occurred before the revelation of this verse, were forgiven. The prohibition of marriage with some relatives had been enjoined in the former divine religions, too. For example, the Torah, book of Leviticus, Chapter 18, verses 6 to 23 are as follows: None of you shall approach to any that is near of kin to him, to uncover their nakedness: I am the LORD.
The nakedness of thy mother, shalt thou not uncover: She is thy mother; thou shalt not uncover her nakedness. The nakedness of thy father's wife shalt thou not uncover: it is thy father's nakedness.