Commentary for Avodah Zarah 14:3
<big><strong>גמ׳</strong></big> אמר רב תחליפא בר אבדימי אמר שמואל יום א' לדברי ר' ישמעאל לעולם אסור:
GEMARA. R. Tahlifa b. Abdimi said in the name of Shmuel: According to R. Ishmael it is always be forbidden [because of] Sunday.
Daf Shevui to Avodah Zarah
If one were to follow R. Ishmael’s ruling, it would always be forbidden to engage in business with idolaters because of Sunday. This is clearly a reference to early Christianity and indeed, in many manuscripts, the text does not say “Sunday” but “the day of the Nazarene.”
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