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Abu Huraira reported Allah’s Messenger (may peace be upon him) as saying:

If anyone gives as Sadaqa the equivalent of a date from that (earning) earned honestly, for Allah accepts that which is lawful, the Lord would accept it with His Right Hand, and even if it is a date, it would foster in the Hand of the lord, as one of you fosters his colt, till it becomes bigger than a mountain.

{Book 005, Chapter 18, Number 2211 : Sahih Muslim}

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