Jeremiah 34:13-16

13“Thus says the Lord, the God of Israel, ‘I made a covenant (solemn pledge) with your forefathers in the day that I brought them out of the land of Egypt, out of the house of bondage, saying,

14“At the end of seven years each of you shall set free his Hebrew brother who has sold himself [into servitude] or who has been sold to you and has served you six years, you shall release him from [serving] you; but your forefathers did not listen [submissively] to Me or obey Me.

15So then you recently turned and repented, doing what was right in My sight, each man proclaiming release [from servitude] to his countryman [who was his bond servant]; and you had made a covenant before Me in the house which is called by My Name.

16Yet you backed out [of the covenant] and profaned My Name, and each man took back his servants, male and female, whom had been set free in accordance with their desire, and you brought them into servitude [again] to be your male servants and your female servants.” ’