Musnad Ahmad 1153:1631

'Abd al-Razzaq narrated to us, he said: Ibn Jurayj informed us, and Rawh said: Ibn Jurayj narrated to us, he said: 'Abdullah ibn 'Ubaydullah ibn Abi Mulaykah informed me that al-Qasim ibn Muhammad informed him that 'Aishah informed him that Sahlah bint Suhayl ibn 'Amr came to the Prophet, peace and blessings of Allah be upon him, and said: "O Messenger of Allah, indeed Salim—Salim, the freed slave of Abu Hudhayfah—is with us in our house, and he has reached what men reach." 'Abd al-Razzaq said: "And he knows what men know." He said: "Breastfeed him, you will become forbidden to him." She said: So I remained for a year, or close to it, not speaking of it out of fear. Then I met al-Qasim and said: "You told me a hadith that I have not told yet." He said: "What is it?" So I informed him of it. He said: "Then narrate it on my authority that 'Aishah informed me of it."