An endowment or a charitable trust set up for Islamic purposes (usually for education, mosques, or for the poor). It involves tying up a property in perpetuity so that it cannot be sold, inherited, or donated to anyone.
A religious obligation of alms-giving on a Muslim to pay a certain amount of his wealth annually to one of the eight categories of needy Muslims (asnāf). The objective is to take away a part of the wealth of the well-to-do to be distributed among the asnāf. According to the Sharīah, zakat purifies wealth and souls.