Jeremiah 34:13

10 All the princes and all the people obeyed, who had entered into the covenant, that everyone should let his man-servant, and everyone his maid-servant, go free, that none should make bondservants of them any more; they obeyed, and let them go:

11 but afterwards they turned, and caused the servants and the handmaids, whom they had let go free, to return, and brought them into subjection for servants and for handmaids.

12 Therefore the word of Yahweh came to Jeremiah from Yahweh, saying,

13 Thus says Yahweh, the God of Israel: I made a covenant with your fathers in the day that I brought them forth out of the land of Egypt, out of the house of bondage, saying,

14 At the end of seven years you shall let go every man his brother who is a Hebrew, who has been sold to you, and has served you six years, you shall let him go free from you: but your fathers didn`t listen to me, neither inclined their ear.

15 You were now turned, and had done that which is right in my eyes, in proclaiming liberty every man to his neighbor; and you had made a covenant before me in the house which is called by my name:

16 but you turned and profaned my name, and caused every man his servant, and every man his handmaid, whom you had let go free at their pleasure, to return; and you brought them into subjection, to be to you for servants and for handmaids.