Musnad Ahmad 907:151

Abdullah ibn al-Walid and Mu’ammal narrated to us—the meaning is the same, and this is the wording of Abdullah—they said: Sufyan narrated to us, from Simak ibn Harb, from Ja’far ibn Abi Thawr, from Jabir ibn Samurah, that a man asked the Messenger of Allah, may Allah bless him and grant him peace: "Should I perform ablution after eating the meat of sheep?" He said: "No." He said: "Should I pray in the sheepfolds?" He said: "Yes." He said: "Should I perform ablution after eating the meat of camels?" He said: "Yes." He said: "Should I pray in their resting places?" He said: "No."