Commentary for Avodah Zarah 93:21
<big><strong>מתני׳</strong></big> מי שהיה ביתו סמוך לעבודת כוכבים ונפל אסור לבנותו כיצד יעשה כונס בתוך שלו ארבע אמות ובונה
If [a Jew] has a house next to an idolatrous shrine and it collapsed, he is forbidden to rebuild it. What should he do? He withdraws a distance of four cubits into his own property and builds there.
Daf Shevui to Avodah Zarah
If one shared a wall with an idolatrous shrine, meaning his house was next to this shrine, he need not tear down his house and move somewhere else. Since he lived there before the shrine was built he does not need to move. However, if the house should fall down he may not rebuild the wall that will be shared with the shrine. What he may do is withdraw four cubits and build his own wall, one which will not be shared with the shrine.
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