A Companion's words
Weak (da'if) — scholars do not use this report as evidence for rulings.
Yahya related to me from Malik from more than one source that when Abdullah ibn Masud was in Kufa, he was asked for an opinion about marrying the mother after marrying the daughter when the marriage with the daughter had not been consummated. He permitted it. When Ibn Masud came to Madina, he asked about it and was told that it was not as he had said, and that this condition referred to foster-mothers. Ibn Masud returnedto Kufa,and he had just reached his dwelling when the man who had asked him for the opinion came to visit and he ordered him to separate from his wife. Malik said that if a man married the mother of a woman who was his wife and he had sexual relations with the mother then…