Sayyiduna Nu'man bin Bashir (may Allah be pleased with them both) says that his father brought him to the Messenger of Allah (peace and blessings be upon him) and said: I have given this son of mine a slave. He (peace and blessings be upon him) said: "Have you given all your children a slave like this?" He answered no, so the Messenger of Allah (peace and blessings be upon him) said: "Take it back."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الهبات / 11992