It is narrated from Hazrat Abu Huraira (may Allah be pleased with him) that the Noble Prophet (peace and blessings be upon him) said: When a servant gives charity from lawful wealth, Allah—Who accepts only what is lawful—accepts it and takes it with His right hand, and just as one of you raises and nurtures his young goat, likewise Allah nurtures it, until a single date becomes like a great mountain.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9423
Hadith Gradingحکم دارالسلام:حدیث صحیح ، وھذا إسناد قوي ، خ : 1410 ، م : 1014