Musnad Abu Ya'la al-Mawsili 4:4

Ibrahim ibn Muhammad ibn ‘Ar‘arah narrated to us, Mu‘tamir ibn Sulayman narrated to us, from Layth, from a freed slave of Musa ibn Talhah, or from a son of Musa ibn Talhah, from his father, from his grandfather, who said: The Prophet of Allah, may Allah bless him and grant him peace, would perform ablution after [consuming] camel milk and its meat, and he would not pray in their resting places. And he would not perform ablution after [consuming] sheep meat and its milk, and he would pray in their enclosures.