Musnad Abu Ya'la al-Mawsili 133:8

Zakariya ibn Yahya al-Wasiti narrated to us, Dawud ibn al-Zibriqan narrated to us, from Hisham, from Muhammad, from Abu Hurayrah, who said: The Messenger of Allah (may Allah bless him and grant him peace) said: "There is not one among you whom his deeds will cause to enter Paradise." We said: "Not even you?" He said: "Not even me, unless my Lord covers me with mercy and grace from Him."