Zakah is an obligation Allah Almighty ordained upon the rich to be given back to the poor. Allah Almighty and His Messenger (may Allah's peace and blessings be upon him) specified all details and rulings related to this obligation so that the rich would not be wronged and the poor's rights would not be lost. In this Hadīth, the Prophet (may Allah's peace and blessings be upon him) says: "No Zakah is payable on the slave except Zakat al-Fitr" i.e., Zakah on personal property is not payable on slaves and slavegirls who serve their owners and are not retained for trade; this is because Zakah is due upon growing wealth, which grows and increases by earning. As for slaves, they are used in the service of their masters and owners. As regards them, their owners either pay only Zakat al-Fitr on their behalf, which is a Sā‘ of food for each slave, or, in case they are slaves with whom their owner does business, he should pay Zakah on the commodities and profits of his trade, if they reach the Nisāb (the minimum Zakatable amount) and witness the passage of one lunar year. The Hadīth shows Allah's mercy toward His servants, as He pardoned the Zakah on slaves..