Musannaf Ibn Abi Shaybah

It is narrated from Hazrat Saeed (may Allah have mercy on him) that if a man said to his wife, "If you enter such-and-such house, you are divorced," and the woman entered that house but the man was unaware. He found out several months later. Regarding this, Hasan, Hazrat Saeed, and Hazrat Khallas (may Allah have mercy on them) say that when he becomes aware, he should appoint witnesses to his revocation.

Hasan (may Allah have mercy on him) says that if a man says to his wife, "If you enter the house of such-and-such person, you will have one divorce," and if she enters and the man was not aware, now if during the waiting period the man had intercourse with her, then intercourse is considered a return (to the marriage), and if he did not do so, then the woman will have one irrevocable divorce.