If a man is caught kidnapping one of his Israelite brothers, whether he treats him as a slave or sells him, the kidnapper must die. So you must purge the evil from among you.
Jewish Publication Society of America Version (JPS1917) - Deuteronomy 24:7 >If a man be found stealing any of his brethren of the children of Israel, and he deal with him as a slave, and sell him; then that thief shall die; so shalt thou put away the evil from the midst of thee.