Al-Mudabbar (the Slave for whose Freedom Death of the Master is a Condition) is from One Third of the Legacy

2. It is narrated from the narrator of the previous Hadith from his father Ahmad ibn Muhammad from Muhammad ibn ’Isma‘il has narrated from al-Fadl ibn Shadhan from all from Ibn Abi ‘Umayr from Hisham ibn al-Hakam who has narrated the following: “I once asked abu ‘Abd Allah عليه السلام, about the case of a man who makes his slave a Mudabbar; if he can change such decision. He (the Imam) said, ‘Yes, he can do so because it is like the will.’”