Musannaf Ibn Abi Shayba 27:227

Affan narrated to us, he said: Shu'bah narrated to us, from Qatadah, from Abu al-'Aliyah, he said: The cousin of your Prophet, may Allah bless him and grant him peace—meaning Ibn 'Abbas—narrated to me, he said: The Messenger of Allah, may Allah bless him and grant him peace, said: "It is not for a servant to say: 'I am better than Yunus ibn Matta.'"