Chapter on Women Permanently Forbidden in Marriage

Permanently forbidden are: one’s mother; every grandmother, no matter how far removed; one’s daughter—even if she was conceived through fornication; the granddaughter (descended through any son or daughter); every sister—whether full, paternal, or maternal—together with her granddaughter; the daughter of every brother and his granddaughter; as well as the paternal aunt and the maternal aunt.

Whatever relationship is barred by blood is likewise barred by suckling (raḍāʿ), except for the foster-mother of one’s brother and the foster-sister of one’s son; both remain lawful to him, just like the daughters of his paternal aunt or uncle and the daughters of his maternal aunt or uncle.

Four women become permanently forbidden through affinity (muṣāharah); three of them merely by the marriage contract: one’s father’s wife, even