Reference for Avodah Zarah 103:15

אמר רב אשי ובמקום תלמידי חכמים כאילו נטעו אצל מזבח שנאמר אצל מזבח

R. Ashi said: [If he does so] in a place where there are disciples of the Sages, it is as though he had planted an Asherah by the side of the altar, as it is stated, “Beside the altar.”

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