The Messenger of Allah ﷺ said, "No one gives charity from what is lawful and good, and Allah accepts only what is good, without the Most Merciful taking it in His right hand. Even if it is a single date, it grows in the palm of the Most Merciful until it becomes greater than a mountain, just as one of you nurtures his young horse or young camel."
حدثنا هاشم حدثنا ليث حدثني سعيد المقبري عن سعيد بن يسار أخي أبي مرثد أنه
قال رسول الله ﷺ ما تصدق أحد بصدقة من طيب ولا يقبل الله إلا الطيب إلا أخذها الرحمن عز وجل بيمينه وإن كانت تمرة فتربو له في كف الرحمن حتى تكون أعظم من الجبل كما يربي أحدكم فلوه أو فصيله
Its isnad is sahih. Bukhari narrated it, 3/278, no. 1410, Fath, and Muslim, 2/702, no. 1014, both in the chapter on zakat, on giving charity from good earnings, and Tirmidhi, 3/45, no. 661, saying it is hasan sahih, and Nasai, 5/57, no. 2525, and Ibn Majah, 1/590, no. 1842.