Musannaf Ibn Abi Shayba 16:380

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Ibn Abi Najih, from Mujahid, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade the meat of the *jallalah* (animal that feeds on filth) sheep.