If a Muslim buys a person who is to be freed upon the mere conclusion of the contract, does this suffice as expiation?

Question : If a person buys someone who is to be freed upon the mere conclusion of the contract.

Answer : Yes. Yes, it suffices. Because it is valid for him that he has freed him; upon the mere conclusion of the contract, it is valid, because if he had wished, he would not have bought him, and he would have remained in slavery.