Musannaf Ibn Abi Shaybah 17055 — A man who marries a woman

Abu Amr al-Shaybani said: Sayyiduna Abdullah bin Mas'ud (may Allah be pleased with him) once gave a fatwa that if a man divorced his wife before consummation, or she died, he could marry that woman's mother. Then, when he came to Madinah, he retracted his fatwa and forbade people from doing so, even though children had already been born to the women after those marriages.