Fiqh-us-Sunnah Volume 3, Zakaat and Fasting, Fiqh 3.003.

Exhortation to Give Zakah in the Hadith|At-Tirmizhi relates from Abu Kabshah alAnmari that the Prophet, upon whom be peace, said: “I swear upon three (things) and ask you to memorize my words: Sadaqah taken from a property never decreases it; a man who suffers injustice and is patient with it, Allah will grant him strength; a man who starts begging, Allah will cause him to be poor.”

Ahmad and at-Tirmizhi relate (and the latter graded it sahih) from Abu Hurairah that the Messenger of Allah, upon whom be peace, said: “Allah receives charity by His right hand, and then He causes it to grow for each of you. Just as you raise a horse, colt, foal, or young weaned camel, so that morsel becomes as large as the Mount of ‘Uhud.”

Of this hadith’s content, Waki’ says: “This is sanctioned by the Qur’an: ‘Do they not know that it is Allah alone who can accept the repentance of His servants and is the (true) recipient of whatever is offered for His sake – and that Allah alone is an acceptor of repentance, a dispenser of grace?’ [at-Taubah 104]. ‘Allah deprives usurious gains of all blessing, whereas He blesses charitable deeds with manifold increase.’ [al Baqarah 276].”

Again, Ahmad relates, with a sound chain of narrators, that Anas said: “A man from the tribe of Tameem came to the Messenger of Allah, upon whom be peace, and said: ‘O Messenger of Allah! I have plenty of property, a large family, a great deal of money, and I am a gracious host to my guests. Tell me how to conduct my life and how to spend.’ The Messenger of Allah, upon whom be peace, replied: ‘Pay zakah out of your property, for truly it is a purifier which purifies you, and be kind to your relatives, and acknowledge the rights of the poor, neighbours, and beggars’.”

It was reported from ‘Aishah that the Messenger of Allah, upon whom be peace, said: “I swear upon three things: Allah does not equate one who has a portion in Islam with one who does not. The portions of Islam are three: prayer, fasting, and zakah. If Allah takes care of a man in this world, He will take care of him on the Day of Judgment. If a man likes a group of people, Allah will certainly include him among them. As for the fourth, if I swear on it, I hope I will not commit a sin: that if Allah conceals a man’s sin in this world, He will certainly not expose him on the Day of Judgment.”

At-Tabarani relates in al-‘Awsat, that Jabir reported: “A man said: ‘O Messenger of Allah! What will be the gains for a man who pays zakah on his assets?’ The Messenger of Allah, upon whom be peace, said: ‘For one who pays zakah on his asssets, he will be removed from the evil in them’.”

On the same subject, al-Bukhari and Muslim relate that Jabir ibn ‘Abdullah reported: “I gave my allegiance to the Messenger of Allah, upon whom be peace, that I will establish salah (prayers) and zakah, and I will give advice to every Muslim.”