Yunus ibn Abd Al-Rahman narrated from Abdullah ibn Muskan from Abu Abdullah Imam Jafar ibn Muhammad Al-Sadiq عليه السلام, who said: "The Commander of the Faithful عليه السلام ruled that the manumitted slave (Al-mudabbar) is to be freed from one-third of the estate. A man has the right to revoke his will, to add to it or reduce from it, as long as he has not passed away."