Hadith 2773
Sayyiduna Abu Dharr (may Allah be pleased with him) said: A companion asked the Noble Prophet (peace and blessings be upon him): Which deed is the best? He replied: “To have faith in Allah, then to strive in the way of Allah.”
Hadith 2774
Sayyiduna Abu Hurairah (may Allah be pleased with him) reports that the Messenger of Allah (peace and blessings be upon him) said: "The best deed in the sight of Allah is faith, there is no doubt in it."