Jeremiah 34:8-11
8The word which came to Jeremiah from Yahweh after King Zedekiah had acut a covenant with all the people who were in Jerusalem to bproclaim 1release to them: 9that each man should let his male slave go free and each man his female slave, a aHebrew man or a Hebrew woman, so that bno one should enslave them, each being a Jew, his brother. 10And all the aofficials and all the people obeyed who had entered into the covenant that each man should let his male slave go free and each man his female slave, so that no one should enslave them any longer; they obeyed and let them go free. 11But afterwards they turned around and returned to themselves the male slaves and the female slaves, whom they had let go as free, and subdued them to be male slaves and female slaves.