Mahmud bin Ghaylan محمود بن غيلان العدوي مولاهم أبو أحمد · The Book on Marriage

The Prophet said: "Whichever man married a woman and entered into her, then it is not lawful for him to marry her daughter. If he did not enter into her then he may marry her daughter. And whichever man married a woman and he entered into her, or he did not enter into her, then it is not lawful for him to marry her mother."

"The Messenger of Allah cursed the Muhill and the one the Muhallal was done for."

"We got some captives on the day of Awtas, and they had husbands among their peopled. They mentioned that to the Messenger of Allah, so the following was revealed: And women who are already married, except those whom your right hands posses.

"The Messenger of Allah returned his daughter Zainab to Abul-As bin Ar-Rabi with a new dowry and a new wedding."