Musannaf Ibn Abi Shayba 1:2079

Husayn ibn Ali narrated to us, from Za'idah, from Musa ibn Abi 'Aishah, who said: Ubaydullah ibn Abdullah ibn Utbah narrated to me, saying: I came to Aisha and said: "Narrate to me about the illness of the Messenger of Allah, may Allah bless him and grant him peace." She said: "Yes. The Messenger of Allah, may Allah bless him and grant him peace, became ill and his condition became heavy, and he fainted. Then he regained consciousness and said: 'Place water for me in the washbasin.' So he performed ghusl. Then he went to stand up, but he fainted. Then he regained consciousness and said: 'Place water for me in the washbasin.' So he performed ghusl."