Commentary for Avodah Zarah 32:3
רבינא רמי מתניתין אברייתא ומשני תנן אין מוכרין להן דובין ואריות ולא כל דבר שיש בו נזק לרבים טעמא דאית ביה נזק הא לית ביה נזק מוכרין
Ravina cast our mishnah against a baraita and then resolved the contradiction: We learned: one should not sell them bears, lions or anything which may injure the public. The reason is because they may injure the public, but if they may not injure the public they may be sold!
Daf Shevui to Avodah Zarah
Ravina notes a direction contradiction between the mishnah and a baraita. The mishnah implies that as long as the animal is not dangerous it may be sold to non-Jews. But the baraita prohibits selling large wild animals under any circumstances.
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