Musannaf Ibn Abi Shayba 16:381

Abu Bakr narrated to us, he said: Waki’ narrated to us, from Sufyan, from Ibrahim ibn al-Muhajir, from Mujahid, who said: The Messenger of Allah (may Allah bless him and grant him peace) forbade the milk of the *jallalah* (an animal that feeds primarily on filth).