Jeremiah 34:10-11

10And all the 1officials 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. 11But 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.