Jeremiah 34
14 Ref At the end of seven years every man is to let go his countryman who is a Hebrew, who has become yours for a price and has been your servant for six years; you are to let him go free: but your fathers gave no attention and did not give ear.
15 Ref 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: