Jeremiah 34:9-14

that every man should set free his male and female slave—a Hebrew man or woman—that no one should keep a Jewish brother in bondage. Now when all the princes and all the people, who had entered into the covenant, heard that everyone should set free his male and female slaves, that no one should keep them in bondage anymore, they obeyed and let them go. But afterward they changed their minds and made the male and female slaves return, whom they had set free, and brought them into subjection as male and female slaves. Therefore the word of the LORD came to Jeremiah from the LORD, saying, “Thus says the LORD, the God of Israel: ‘I made a covenant with your fathers in the day that I brought them out of the land of Egypt, out of the house of bondage, saying, “At the end of seven years let every man set free his Hebrew brother, who has been sold to him; and when he has served you six years, you shall let him go free from you.” But your fathers did not obey Me nor incline their ear.