Musnad Abu Ya'la al-Mawsili 149:44

Shayban ibn Farrukh narrated to us, Hammad ibn Salamah narrated to us, from Hammad, from Ibrahim, from al-Aswad, from Aisha, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "The pen is lifted from three: from the sleeper until he wakes up, from the boy until he reaches puberty, and from the insane person until he regains his sanity."