Musannaf Ibn Abi Shayba 9:1485

Abu Bakr narrated to us, he said: Abu Mu'awiyah narrated to us, from 'Asim, from Bakr, from al-Mughirah ibn Shu'bah, who said: I proposed to a woman, and the Prophet, peace and blessings of Allah be upon him, said to me: "Have you looked at her?" I said: "No." He said: "Then look at her, for it is more likely that there will be harmony between you two."