Sahih Muslim Book 39, Hadith Number 6762.
Chapter : None would attain salvation because of his deeds but it is through Lord’s Mercy (that he would attain that).
Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying: There is none amongst you whose deeds alone would attain salvation for him. They (the Companions) said: Allah’s Messenger, not even you? He (the Holy Prophet) said: Not even I, but that Allah wraps me in Mercy and He grants me pardon. Ibn ‘Aun pointed towards his head with his hand saying: Not even I, but that Allah wraps me in His Forgiveness and Mercy.