Musannaf Ibn Abi Shaybah 33072 — A man who bequeaths his third

It is reported from Ash'ath that al-Hasan and Muhammad bin Sirin said concerning a man who made a bequest of a third of his wealth for his slave: This wealth is to be given out of his own neck. So if the third is more than his price, he is to be freed and the remaining wealth is to be given to him; and if it is less than his price, he becomes free and is to earn the rest of the price for the heirs. And if a dying person made a bequest of dirhams for slaves, then if the heirs wish they may carry out that bequest, and if they wish they may not carry it out.