What is the ruling regarding intercourse during menstruation, post-natal bleeding, or Ihram concerning the permissibility of other female relatives?
Chapter on What is Prohibited to Marry and Combining Between Them and Other Matters
Al-Mughni
Book of Marriage
Primary text
If a man has intercourse with a woman while she is menstruating, in post-natal bleeding (nifas), or while in the state of Ihram, her sister becomes prohibited to him. Moreover, her mother and daughter become permanently prohibited to him (ta'bid).