Musnad Ahmad 28:581

'Affan narrated to us, Hammad narrated to us, from 'Ata' ibn al-Sa'ib, from his father, from 'Abdullah ibn 'Amr, that a man said: "O Allah, forgive me and Muhammad, and no one else." The Messenger of Allah (peace and blessings of Allah be upon him) said: "You have indeed withheld it from many people."