Sayyiduna Harithah bin Wahb and Sayyiduna al-Mustawrid (may Allah be pleased with them both) said: The Messenger of Allah (peace and blessings be upon him) said: "Give charity, for soon a day will come on which charity will not be accepted."
Hadith Referenceالمعجم الكبير للطبراني / باب الحاء / 3248