Musnad Abu Ya'la al-Mawsili 109:237

Abu Khaythama narrated to us, Rawh narrated to us, Husayn al-Mu'allim narrated to us, from 'Ata', from Jabir: That a man emancipated a slave of his [to take effect] after his death, and the man became in need. So the Prophet (peace and blessings of Allah be upon him) said, "Who will buy him from me?" So Nu'aym ibn 'Abd Allah bought him, and he took his price and gave it to him.