Musnad Ahmad 907:150

'Abd al-Rahman narrated to us, Za'idah narrated to us, from Simak, from Ja'far ibn Abi Thawr, from Jabir ibn Samurah, from the Prophet (peace be upon him), that a man came to him and said: "Should I perform ablution after eating the meat of sheep?" He said: "No." He said: "Should I pray in their resting places?" He said: "Yes, if you wish." He said: "Should we perform ablution after eating the meat of camels?" He said: "Yes." He said: "Should I pray in their resting places?" He said: "No."