Abu Hurairah said: “The Messenger of Allah صلی اللہ علیہ وآلہ وسلم said: ‘None gives charity from (wealth earned from) a good source — and Allah does not accept anything but that which is good — but the Most Merciful takes it in His right hand, even if it is a date, and it is tended in the hand of the Most Merciful until it becomes greater than a mountain, just as one of you tends his foal or camel calf.” (Sahih)