Jeremiah 34:9-11

9that each person was to set his male servant free and each his female servant, a 1Hebrew man or a Hebrew woman, so that 2no one would keep them, his Jewish brother or sister, in bondage. 10And all the 3officials 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.