Musnad Ahmad 30:2100

Ya'mar ibn Bishr narrated to us, Abdullah narrated to us, he said: Yunus informed us, from al-Zuhri, he said: Sa'id ibn al-Musayyib informed me that he heard Abu Hurairah saying: The Messenger of Allah, peace and blessings of Allah be upon him, said: "The best of charity is what is given out of wealth that remains after one's needs are met, and begin with those whom you support."