4. Ali ibn Ibrahim has narrated from Muhammad ibn ‘Isa from Yunus from certain persons of his people who has narrated the following: “Ali ibn al-Husayn, ‘Alayhim al-Salam, has said, ‘A testator has the right to change his will, thus he can set free those whom he had willed to remain slaves or keep the slaves those that were freed in his will; give those who were deprived and deprive those whom he had given as long as he is alive.’”