Musnad Abu Ya'la al-Mawsili 166:7

Muhammad ibn Abdullah narrated to us, Yunus ibn Bukayr narrated to us, from Muhammad ibn Ishaq, from Isma'il ibn Abi Hakim, from al-Qasim ibn Muhammad, from Abdullah ibn Ja'far, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "Let no one say that I am better than Yunus ibn Matta."