פירוש על עבודה זרה 30:3

Abaye points out that what Rabbah says is not true. Just because one is commanded to make sure that no forbidden work is done with one’s possession does not mean that he cannot sell it to someone who will not observe the commandment. Bet Hillel allows one to sell a field for plowing to a person who might plow it because there is a chance that they will not plow it.