Musnad Ahmad 20:16

Hashim ibn al-Qasim narrated to us, al-Mas'udi narrated to us, a sheikh who came to us from the Hijaz narrated to us, he said: I witnessed Abdullah ibn al-Zubayr and Abdullah ibn Ja'far at Muzdalifah. Ibn al-Zubayr was cutting meat for Abdullah ibn Ja'far. Abdullah ibn Ja'far said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, say: "The best meat is the meat of the back." *** Ahmad ibn Abd al-Malik narrated to us, Muhammad ibn Salamah narrated to us, from Muhammad ibn Ishaq, from Isma'il ibn Abi Hakim, from al-Qasim, from Abdullah ibn Ja'far, he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: "It does not befit a prophet to say: 'I am better than Yunus ibn Matta.'" Abu Abd al-Rahman said: And Harun ibn Ma'ruf narrated it to us, the same as it.