[About the Islamic Tax (zakāt) :] Then, Islamic tax has been laid down along with prayer as a sacrifice (to be offered) by the people of Islam. Whoever pays it by way of purifying his spirit, it serves as a purifier for him and a protection and shield against fire (of Hell). No one therefore (who pays it) should feel attached to it afterwards, nor should feel grieved over it. Whoever pays it without the intention of purifying his heart expects through it more than its due. He is certainly ignorant of the sunnah, he is allowed no reward for it, his action goes to waste and his repentance is excessive.