Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both) said that a man of the Ansar freed a slave of his, to become free after his death, and he had no other wealth. This news reached the Prophet (peace and blessings be upon him), and he (peace and blessings be upon him) asked: "Who will buy him from me?" Sayyiduna Nu'aym bin Abdullah (may Allah be pleased with him) bought him for 800 dirhams, and he (peace and blessings be upon him) gave the price to the owner. I heard Sayyiduna Jabir (may Allah be pleased with them both) say: That Coptic slave died in the very first year.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب المدبر / 21531