Musnad Ahmad 790:111

'Ali narrated to us, Mu'adh narrated to us, my father narrated to me, from 'Awn—who is al-'Uqayli—from Mutarrif, from 'Imran ibn Husayn, who said: The general supplication of the Prophet of Allah, may Allah bless him and grant him peace, was: "O Allah, forgive me for what I did by mistake and what I did intentionally, and what I kept secret and what I made public, and what I did out of ignorance and what I did deliberately."