Musannaf Ibn Abi Shaybah

Hazrat Hasan (may Allah be pleased with him) was asked: If a man says to his wife, "If you enter the house of such-and-such person, you are divorced," and afterwards that house collapses, what is the ruling? He replied: If the house has been demolished, then divorce will not take place. Hazrat Abu Hashim (may Allah have mercy on him) says: If the house belonged to that man, or if a pathway was made and the woman passed through there, then she will be divorced.