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 in His right hand. And just as one of you raises and nurtures his young goat, likewise Allah nurtures and increases it, until a single date grows in the hand of Allah to become as large as a mountain.
Hadith Referenceمسند احمد / مسند المكثرين من الصحابة / 9565
Hadith Gradingحکم دارالسلام:حدیث صحیح ، وھذا إسناد قوي ، خ : 1410 ، م : 1014