Musnad Ahmad 1153:1895

'Abd al-Razzaq narrated to us, Ma'mar narrated to us, from al-Zuhri, from 'Urwah, from 'A'ishah, she said: Sahlah bint Suhayl came to the Prophet, peace and blessings of Allah be upon him, and said: "Salim used to be called the son of Abu Hudhayfah, and Allah, the Mighty and Majestic, has revealed His Book: 'Call them by [the names of] their fathers' [al-Ahzab: 5]. He used to enter upon me while I was in a state of undress, and we were in a narrow house." He said: "Breastfeed Salim, and you will become unlawful for him."