פירוש על קידושין 35:12

Rava points out that R. Eliezer is more consistent than the rabbis. According to the rabbis if his theft was worth five hundred and he is worth one thousand he is not sold because we cannot sell half of him. But so too we could read the other word in the the verse with precision—that he cannot be sold to recover half of his theft, not even once. Thus, according to R. Eliezer, unless the theft and purchase price are exactly the same, the slave cannot be sold.