Those who pronounce ẓihār1 among you [to separate] from their wives - they are not [consequently] their mothers. Their mothers are none but those who gave birth to them. And indeed, they are saying an objectionable statement and a falsehood. But indeed, Allāh is Pardoning and Forgiving.
Translation: Saheeh International (English)
1 The saying by a husband to his wife, "You are to me like the back of my mother," meaning unlawful to approach. This was a type of divorce practiced by the Arabs before the prophethood of Muḥammad (ﷺ).
Those who do Ẓihār to their wives, by saying to them: “You are for me like the back of my mother”, have lied in this statement of theirs. Their wives are not their mothers; their mothers are only those women who gave birth to them, and when they make such statements they are uttering a disgusting, false statement. But indeed, Allah is overlooking and forgiving: He has legislated an atonement for you to free you of the sin.