Hadhrat Abu Dharr (ra) relates: I asked the Holy Prophet (saws): What is most meritorious? He said: Faith in Allah and striving in His cause.  I asked: The freeing of which slave is best?  He said: Of that one whom the master likes best and whose value is highest.  I asked: If one is not able to do that? He said: Then help someone with his work, or make something for someone who is not able to make it himself.  I asked: If one should not have the strength? He said: Restrain thyself from doing harm to anyone for that also is charity towards thyself. (Bokhari and Muslim)