Musannaf Ibn Abi Shaybah

Hasan says that if a person says, "If I do such and such deed, then my slave is free," and then he sells that slave and does that deed, then nothing will be required of him.

Hazrat Saeed bin Al-Musayyib, Hazrat Hakam, and Hazrat Ata say regarding the person who says to his slave that if I enter the house, my slave is free, then he sells his slave and enters the house, they say that the slave will not be free.

Hasan says about the person that if I do such and such things, then my slave is free.

Hazrat Ibn Shubrumah says regarding the person who says: "If I do such and such act, then my slave is free or my wife is divorced," then he frees the slave or divorces the wife, and then breaks his oath, the jurists say that freedom and divorce will become obligatory upon him.