A man who says to his wife "If you enter this house you are divorced", and she enters without his knowing: those who said he calls witnesses to taking her back when he learns of it

It is reported from Sa'id (may Allah have mercy on him): If a man said to his wife, "If you enter the house of so-and-so, you are divorced," and the woman entered that house but the man did not know of it, and he came to know several months later, then concerning this al-Hasan, Sa'id and Khilas (may Allah have mercy on them) said: When he comes to know, he should make witnesses to his taking her back.

Al-Hasan (may Allah have mercy on him) said: If a man said to his wife, "If you enter the house of so-and-so, you are divorced once," and she entered while the man did not know, then if the man had intercourse with her during the waiting period, his intercourse is a taking back; and if he had not, the woman becomes separated from him by one irrevocable (ba'in) divorce.