פירוש על עבודה זרה 30:8

Abaye uses this long baraita as a (somewhat convoluted) difficulty on Rabbah. The baraita shows that Samaritans are not suspected of bestiality, nor are they suspected of a few other crimes. But nevertheless, there is a custom not to sell them small animals. And when it comes to large animals, the law is always stricter, as we saw in the Mishnah. Abaye thinks it is prohibited to sell large animals to Samaritans because they would sell it to idolaters. So how can Rabbah sell an animal to a Jew known to sell to idolaters?