Jeremiah 34:15-16

And now, turning away from evil, you had done what is right in my eyes, giving a public undertaking for every man to make his neighbour free; and you had made an agreement before me in the house which is named by my name: But again you have put shame on my name, and you have taken back, every one his man-servant and his servant-girl, whom you had sent away free, and you have put them under the yoke again to be your servants and servant-girls.