Musnad Ahmad 30:3658

Wahb ibn Jarir narrated to us, my father narrated to us, from Muhammad ibn Sirin, from Abu Hurairah, who said: The Messenger of Allah (peace and blessings of Allah be upon him) said: "There is not one among you whom his deeds will enter into Paradise, nor save him from the Fire." They said: "Not even you, O Messenger of Allah?" He said: "Not even me, unless Allah covers me with mercy and grace from Him." (He said this) twice or three times.