A’isha, the wife of Allah’s Messenger صلى الله عليه وسلم, reported that Allah’s Messenger صلى الله عليه وسلم used to say: “Observe moderation (in doing deeds), and if you fail to observe it perfectly, try to do as much as you can do and be happy for none would be able to get into Paradise because of his deeds alone.” They (the Companions of the Holy Prophet) said: “Allah’s Messenger, not even you?” Thereupon he said: “Not even I, but that Allah wraps me in His Mercy, and bear this in mind that the deed loved most by Allah is one which is done constantly even though it is insignificant.”

Sahih Muslim, Book 039, Number 6770