Hadithcore
Riyad as-Salihin, 560

Abu Hurairah (May Allah be pleased with him) reported:

Messenger of Allah (ﷺ) said, "He who gives in charity the value of a date which he legally earned, and Allah accepts only that which is pure, Allah accepts it with His Right Hand and fosters it for him, as one of you fosters his mare, until it becomes like a mountain." <b>[Al- Bukhari and Muslim]</b>.

وعنه قال‏:‏ قال رسول الله صلى الله عليه وسلم ‏:‏ ‏

‏من تصدق بعدل تمرة من كسب طيب، ولا يقبل إلا الطيب، فإن الله يقبلها بيمينه، ثم يربيها لصاحبها كما يربى أحدكم فلوه حتى تكون مثل الجبل ‏

‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏ “الفلو” بفتح الفاء وضم اللام وتشديد الواو، ويقال أيضاً‏:‏ بكسر الفاء وإسكان اللام وتخفيف الواو‏:‏ وهو المهر ‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 560
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) Allah is good and only accepts what is good. So, the person giving charity should make sure that what he is giving in charity was lawfully earned.<br> 2) It points out the promise of Allah Almighty to multiply charity given out of lawfully earned money until it becomes like a mountain. This is indeed one of the fruits of lawful earning.
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