Jeremiah 34:7-11

when the army of the king of Babylon was fighting against Jerusalem and all the remaining cities of Judah, that is, Lachish and Azekah, for they alone remained as fortified cities among the cities of Judah.

The word that came to Jeremiah from the Lord after King Zedekiah had made a covenant with all the people who were in Jerusalem, to proclaim release to them:

that each person was to set his male servant free and each his female servant, a Hebrew man or a Hebrew woman, so that no one would keep them, his Jewish brother or sister, in bondage.

And all the officials and all the people obeyed who had entered into the covenant that each person was to set his male servant free and each his female servant, so that no one would keep them in bondage any longer; they obeyed, and set them free.

But afterward they turned around and took back the male servants and the female servants whom they had set free, and brought them into subjection as male servants and as female servants.