Sayyiduna Ismah (may Allah be pleased with him) said: The Messenger of Allah (peace and blessings be upon him) had prayed the Zuhr prayer and was sitting in the mosque when a man came and began to pray, so the Prophet (peace and blessings be upon him) said: "Is there no one who will give charity to this man by praying with him?"
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14551