Musnad Ahmad 30:3821

Hashim narrated to us, Ibrahim ibn Sa'd narrated to us, my father narrated to me, from Humayd ibn Abd al-Rahman, from Abu Hurayrah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "It is not appropriate for a servant to say: 'I am better than Yunus ibn Matta.'"