The one who Ali was thinking of marrying is the daughter of Abu Jahl and the Prophet salla Allahu alaihi wa sallam said that by Allah the daughter of the enemy of Allah and the daughter of the Messenger of Allah will not be joined under one man.
The one who Ali was thinking of marrying is the daughter of Abu Jahl and the Prophet salla Allahu alaihi wa sallam said that by Allah the daughter of the enemy of Allah and the daughter of the Messenger of Allah will not be joined under one man.