Khalid bin Mahran al-Hadha' خالد بن مهران الحذاء · The Book of Manumission of Slaves

If a man is shared by two men, and one of them emancipates his share, a price of the slave will be fixed, not more or less, and he will be emancipated by him in case he is rich.

A man who had no other property emancipated six slaves of his at the time of the death. When the Prophet (ﷺ) was informed about it, he spoke severely of him. He then called them, divided them into three sections, cast lots among them, and emancipated two and kept four in slavery.