Narrated Abu Dhar: I asked the Prophet, What is the best deed? He replied, To believe in Allah and to fight for His Cause. I then asked, What is the best kind of manumission (of slaves)? He replied, The manumission of the most expensive slave and the most beloved by his master. I said, If I cannot afford to do that? He said, Help the weak or do good for a person who cannot work for himself. I said, If I cannot do that? He said, Refrain from harming others for this will be regarded as a charitable deed for your own good.