Sayyiduna Abu Kabshah al-Anmari (may Allah be pleased with him) said that he heard the Messenger of Allah (peace and blessings be upon him) say: "I will tell you a hadith, and I swear by three things: a servant's wealth is never decreased by giving charity; no servant is wronged and bears it with patience but that Allah increases him in honour because of it; and no servant opens a door of begging but that a door of poverty is opened for him."
Hadith Referenceالمعجم الكبير للطبراني / مسند من يعرف بالكنى / 19058