Reference for Avodah Zarah 53:19

אמר רב חסדא אמר מר עוקבא אבל אם אמר לו סם פלוני יפה לו סם פלוני רע לו מותר

R. Hisda said in the name of Mar Ukba: But if he said to him that such and such medicine is good for him and such and such medicine is bad for him, it is permitted [to follow his advice]

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