From Sahih Muslim (Hadith 2363):
Abu Musa reported Allah's Apostle (ﷺ) as saying:The honest Muslim trustee who spends (sometimes he said" who gives" ) what he is commanded to do and he gives that in full with his heart overflowing with cheerfulness and he gives it to one to whom he is ordered, he is one of the givers of charity
Reference: Muslim 2363