Sahih Muslim
The Book Giving Description of the Day of Judgement, Paradise and Hell (Kitab Sifat Al-Qiyamah wal Janna wan-Nar)
Book Number: 039 / Hadith Number: 6763
Abu Huraira reported Allah's Messenger (may peace be upon him) as saying: There is none whose deeds alone can'secure salvation for him. They said: Allah's Messenger, not even you? Thereupon he said: Not even I, but that, the Mercy of Allah should take hold of me.