Jeremiah 34:15-16

15And ye had now turned, and had done right in my sight, in proclaiming liberty every man to his neighbour; and ye had made a covenant before me in the house which is called by my name:12 16But ye turned and profaned my name, and caused every man his male servant, and every man his female servant, whom he had set at liberty at their pleasure, to return, and brought them into subjection, to be to you for male and female servants.