Musannaf Ibn Abi Shayba 37:320

Mu'awiyah narrated to us, he said: Sharik narrated to us, from Uthman, from Zadhan, from Hudhayfah, who said: "How will you be when a time comes to you where one of you will go out from his private chamber to his privy, and he will return having been transformed into a monkey, so he will seek his sitting place and not find it?"