Jeremiah 34:7-11

MLV(i) 7 when the king of Babylon's army was fighting against Jerusalem and against all the cities of Judah that were left, against Lachish and against Azekah, for these alone remained of the cities of Judah, fortified cities.
8 The word that came to Jeremiah from Jehovah, after the king Zedekiah had made a covenant with all the people who were at Jerusalem, to proclaim liberty to them, 9 that every man should let his man-servant and every man his maid-servant, who is a Hebrew man or a Hebrew woman, go free, that none should make bondmen of them, namely, of a Jew his brother.
10 And all the rulers and all the people obeyed, who had entered into the covenant, that everyone should let his man-servant and everyone his maid-servant, go free, that none should make bondmen of them any more. They obeyed and let them go.
11 But afterwards they turned and caused the servants and the handmaids, whom they had let go free, to return and brought them into subjection for servants and for handmaids.