Leviticus 25:42 "They shall not be sold as slaves"

As explained in Negative Mitzvah 257 a Jew is sold into slavery to be educated and taught the right way to live and conduct himself.

We should not break his spirit and make him feel even more degraded than he feels already.

The Torah commands us to be very thoughtful and understanding of his unfortunate state and avoid shaming him in public.

We should never carry out the sale of a Jewish slave in an open slave market. It should be done quietly and discreetly.