Musnad Ahmad 1153:841

Ibrahim and Ali ibn Ishaq narrated to us, they said: Ibn al-Mubarak informed us, from Ma'mar and Yunus. And Ali ibn Ishaq said: Abdullah informed us, he said: Ma'mar and Yunus informed us, from al-Zuhri, he said: Ubayd Allah ibn Abdullah ibn Utbah ibn Mas'ud informed me, that Aisha, the wife of the Prophet, may Allah bless him and grant him peace, said: "When the Messenger of Allah, may Allah bless him and grant him peace, became heavy and his pain intensified, he asked permission from his wives to be nursed in my house, and they gave him permission."