Bear: It’s the Lifnei Eideihem, Kal V’chomer Eideihem Atzman. The Rambam (in the uncensored editions) Paskened (based on the Gemara) that Sunday is a Christian holiday. Therefore, it’s Assur to ever do business with Catholics in Eretz Yisrael, where the Din of Lifnei Eideihem still applies.
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