Abu al-Zubayr heard Jabir bin Abdullah (may Allah be pleased with them both) say: Abu Madhkur was a man of Banu Udhrah; he had a Coptic slave whom he made a mudabbar. The Prophet (peace and blessings be upon him) heard about that slave and sold the slave, and said: "When a man is poor, let him begin with himself first. If there is a surplus, then let him include along with himself those whom he supports; and if there is still a surplus, then let him give charity to others."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المدبر / 21537