[If] one’s house adjoined an idolatrous shrine and it collapsed, he is forbidden to rebuild it. How shall he do [it]? He with-draws four cubits into his own [property] and builds. [If] it belonged both to him and the idolatrous shrine, it is judged to be half and half. Its stones, timber, and mortar contaminate with tumah as does the sheretz, as it says: You shall utterly detest it. R’ Akiva says: As does the menstruant, as it says: You shall scatter them afar as the menstruant, “Get out!” you shall say to it. Just as a menstruant contaminates with tumah by being carried, so too an idolatrous object contaminates with tumah by being carried.