Chapter# 13, Book 15, Number 4115:
Jabir b. ‘Abdullah said that a person among the Ansar declared his slave free after his death, as he had no other property. This news reached the Apostle of Allah (may peace be upon him) and he said: Who will buy him from me? And Nu’aim b. al-Nahham bought him for eight hundred dirhams and he handed them over to him, ‘Amr (one of the narrators) said: I heard Jabir b. ‘Abdullah as saying: He was a Coptic slave, and he died in the first year (of the Caliphate of ‘Abdullah b. Zubair).
Book 16: The Book Pertaining to the Oath, for Establishing the Responsibility of Murders, Fighting, Requital and Blood-Wit (Kitab Al-Kitab Al-Qasama wa’l-Muharaba wa’l-Qisas wa’l-Diyat)