Musnad Ahmad 31:622

'Affan narrated to us, Wuhayb narrated to us, Sulayman al-Aswad narrated to us, from Abu al-Mutawakkil, from Abu Sa'id, that a man came when the Prophet (peace and blessings of Allah be upon him) had already prayed. He (the Prophet) said: "Is there no man who will give charity to this one, so he may pray with him?"