Musnad Ahmad 30:2132

'Affan and Bahz narrated to us, they said: Shu'bah narrated to us, he said: Sa'd ibn Ibrahim narrated to me, he said: I heard Humayd ibn 'Abd al-Rahman narrating from Abu Hurayrah, from the Prophet, peace and blessings of Allah be upon him, who said: "It is not fitting for a servant to say: 'I am better than Yunus ibn Matta.'"