Sefer Chasidim 435:1ספר חסידים תל״ה:א׳
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Shulchan Arukh, Yoreh De'ah 149:2שולחן ערוך, יורה דעה קמ״ט:ב׳
When is this said? By a lodger. But a resident of a city is permitted. And if he is traveling by caravan it is permitted. (Ram"a: A courtyard of idol worship, some say its law is like a city of idol worship. (Tur quoting the Rashb"a) And at a time that the idol worshipers to not gather there for their "prayers", it is permitted to enter there. (Tur quoting R' Yonah and the Ros"h) And some say that under any circumstances it is forbidden if there is no way to pass through it to another place. But if the path passes to another place all agree that it is permitted. And so the custom is widespread to go through that courtyard to another place. (Rashb"a) Nevertheless, the pious act is to distance oneself form going through it if there is another path of similar shortness. (D"A and so is implied in the Sefer Chasidim) And see above, Chapter 142.
Jerusalem Talmud Avodah Zarah 1:4:5תלמוד ירושלמי עבודה זרה א׳:ד׳:ה׳
“May one go there?” If he was a guest, it is forbidden; a town dweller is permitted. A caravan is permitted since caravans go everywhere.
Shulchan Arukh, Yoreh De'ah 150:1שולחן ערוך, יורה דעה ק״נ:א׳
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Sefer Chasidim 612:1ספר חסידים תרי״ב:א׳
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