Al-Adab al-Mufrad

It is narrated from Sayyiduna Abu Dharr (may Allah be pleased with him), who reports from the Prophet (peace and blessings of Allah be upon him) that he was asked: "Which deed is the best among deeds?" The Prophet (peace be upon him) replied: "To have faith in Allah, and to strive (do jihad) in His way." It was asked: "Which slave is best to set free?" The Prophet (peace be upon him) replied: "The one whose price is highest and who is most valued by his owners." The questioner asked: "If I am not able to do some of these deeds, then what do you instruct me to do?" The Prophet (peace be upon him) replied: "Then help someone who is working or do work for someone who is unskilled or incapable." The questioner asked: "If I become too weak to do even this?" The Prophet (peace be upon him) replied: "Then restrain yourself from harming people (and do not cause them trouble); this will be a charity from you upon yourself."