Musannaf Ibn Abi Shaybah 33042 — A man who favors some of his children

Muhammad bin al-Nu'man narrates from his father that his father gifted him a slave and then came to the Prophet (peace and blessings be upon him) in order to make him a witness to this. He asked: "Have you gifted a slave like this to every one of your children?" He replied: No. He said: "Take that slave back from him."