Musnad Ahmad 30:3602

Sulayman ibn Dawud narrated to us, Shu'bah narrated to us, from Abu Ziyad al-Tahhan, who heard Abu Hurayrah narrating from the Prophet, peace and blessings of Allah be upon him, who said: "There is not one among you whom his deeds will save." They said: "Not even you, O Messenger of Allah?" He said: "Not even me, unless Allah covers me with mercy from Him."