I asked Abu Abdullah (as) about a man whose father was a slave and whose father had a wife who was a mukatabah (a bondwoman under a contract for her freedom) and had already paid part of what she owed. The son of the slave said to her: "Would you like me to help you complete your manumission payment so that you can fulfill what you owe, on the condition that you will not have the option to separate from my father once you gain your freedom?" She agreed, and he gave her the amount for her manumission. I asked: "Would she still have the choice to leave his father after that?" Imam (as) replied: "No, she does not have the option. Muslims are bound by their conditions."