Abu Ghassan al-Misma'i, Malik ibn 'Abd al-Wahid, narrated to me: Bishr ibn al-Mufaddal narrated to us, from Suhayl ibn Abi Salih, who said: I heard a son of Abu Sa'id al-Khudri narrating to my father, from his father, who said: The Messenger of Allah, peace and blessings be upon him, said: "When one of you yawns, let him place his hand over his mouth, for the devil enters."