Be not over much angry with thy slave;
Treat him not unjustly, and pain not his feelings.
True, thou mayst have bought him for ten direms;
But 'twas not by thy power that he was created.
There is a tradition of the Prophet--peace be upon him!--that on the day of the resurrection the greatest grief will be when the pious slave is carried to Paradise, and his worthless master is borne away to Hell.