Sayyiduna Abu Hurayrah (may Allah be pleased with him) said that the Messenger of Allah (peace and blessings be upon him) said: "Charity does not decrease wealth in any way. Allah Almighty increases a servant in honour through his forgiving, and whoever humbles himself for the sake of Allah, Allah Almighty raises him."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الزكاة / 7817