Musnad Ahmad 1153:1543

Abdullah said: I found this hadith in my father’s book in his own handwriting: Abd al-Rahman ibn Mahdi narrated to us, from Sufyan, from Jabir, from Abd al-Rahman ibn al-Aswad, from his father, from Aisha, that the Messenger of Allah, peace and blessings of Allah be upon him, used to perform ablution when he came out of the privy.