Musannaf Ibn Abi Shayba 3:1149

Abu Khalid al-Ahmar narrated to us, from al-Hasan ibn Ubayd Allah, from Talha, from Abd al-Rahman ibn Awsaja, from al-Bara’ ibn Azib, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Straighten your rows, lest the devils penetrate between you like the offspring of the *hadhaf*." It was said: "O Messenger of Allah, and what is the offspring of the *hadhaf*?" He said: "Black, hairless sheep that are in the land of Yemen."