3,768. Are We Concerned About the Possibility of Resale?

Hilchos Shemittah v’Yoveil 8:5

A potter may sell a Jew five oil jugs and fifteen wine jugs, and more to a non-Jew. The seller need not be concerned that the non-Jew might then sell them to a Jew. It is permitted to sell many jugs to a Jew outside of Israel without concern that he might bring them to Israel.

Hilchos Shemittah v’Yoveil 8:6

During shemittah, one may sell a cow that plows to a person who is suspected of violating shemittah because it’s possible to slaughter it (which is permitted). One may sell him a field because he might leave it fallow. One may not sell him an orchard unless he makes a condition that the buyer doesn’t have rights to the trees’ fruit. One may lend him a seah measure* even if he knows that the suspected person has a grain silo because he might use it to measure in his house. One may change money for a person even if he is known to have employees violating shemittah. In all these cases, if the buyer says outright that he plans to use the item in question in a prohibited manner, it is prohibited to sell it to him.

*A seah is about 2.5 gallons.