Musannaf Ibn Abi Shayba 3:1504

Zayd ibn al-Hubab narrated to us, he said: Abd al-Malik ibn al-Rabi’ ibn Sabrah narrated to us, from his father, from his grandfather, that the Messenger of Allah (may Allah bless him and grant him peace) said: "Do not pray in the resting places of camels, and pray in the enclosures of sheep."