Sayyiduna Usamah bin Sharik (may Allah be pleased with him) said: I heard the Messenger of Allah (peace and blessings be upon him) saying: "No one will enter Paradise merely on the basis of his deeds." We said: O Messenger of Allah, not even you? He (peace and blessings be upon him) said: "No, not even I, unless Allah, the Mighty and Majestic, covers me with His mercy." And he (peace and blessings be upon him) placed his hand on his head.
Hadith Referenceالمعجم الكبير للطبراني / باب الألف / 490