Musnad Ahmad 1153:782

Aswad narrated to us, he said: Sharik narrated to us, from Muhammad ibn Abd al-Rahman, from Kurayb, from Aisha, she said: "The Messenger of Allah, peace and blessings of Allah be upon him, would be in a state of major ritual impurity (junub), then he would sleep, then he would wake up, then he would sleep, and he would not touch water."