Muhammad bin Nu'man and Humayd bin Abd al-Rahman both heard Nu'man bin Bashir (may Allah be pleased with him) say: My father gave me a slave, and my mother told me to go to the Messenger of Allah (peace and blessings be upon him) and make him (peace and blessings be upon him) a witness to it. He (peace and blessings be upon him) said: "Have you given all your children a gift like this?" He said: No. He (peace and blessings be upon him) said: "Then take it back."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الهبات / 11993