Imam Malik's Muwatta, Chapter: Judgements

Yahya related to us from Malik from Ibn Shihab from Humayd ibn Abd ar-Rahman ibn Awf and from Muhammad ibn an-Numan ibn Bashir that they related to him that an-Numan ibn Bashir said that his father Bashir brought him to the Messenger of Allah, may Allah bless him and grant him peace, and said, "I have given this son of mine one of my slaves." The Messenger of Allah, may Allah bless him and grant him peace, said, "Have you given each of your children the same as this?" He said, "No." The Messenger of Allah, may Allah bless him and grant him peace, said, "Then take the slave back."