Wealth and Society Part 01
Zakat, which Islam has enjoined upon Muslims, marks the lowest limit of the expression of human sympathy, kindness and compassion. It is a duty, the disregard or violation of which is not in any circumstances tolerable to God. The Shariah is emphatic in its insistence upon its observance. It has prescribed it as an essential requirement of Faith for Muslims.
But if they repent and establish worship and pay the poor-due, then they are your brethren (Al-Tawba:11)