The Holy Quran 4:22 — Surah An-Nisa
Arabic text
وَلَا تَنكِحُوا۟ مَا نَكَحَ ءَابَآؤُكُم مِّنَ ٱلنِّسَآءِ إِلَّا مَا قَدْ سَلَفَ ۚ إِنَّهُۥ كَانَ فَـٰحِشَةً وَمَقْتًا وَسَآءَ سَبِيلًا
Translation
Do not marry those women whom your fathers married, except that (you will not be sinful for doing this during the period before you became a Muslim) which has passed (because you were then not bound by this law). Undoubtedly this is immoral (indecent), detestable (distinguishing) and an evil path.
Tafsir (excerpt) — Tafsir Usmani
Prohibition of marrying the wives of one's father and grandfathers: the people of the Jahiliyyah (the pre-Islamic Age of Ignorance) used to marry their stepmothers as well as some other muharramat (women forbidden in marriage), which were mentioned just now. This is now being prohibited: do not marry the women whom your fathers have married.
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