Jeremiah 34:9-14

Everyone was to free their Hebrew slaves, both male and female; no one was to hold a fellow Hebrew in bondage. So all the officials and people who entered into this covenant agreed that they would free their male and female slaves and no longer hold them in bondage. They agreed, and set them free. But afterward they changed their minds and took back the slaves they had freed and enslaved them again. Then the word of the LORD came to Jeremiah: “This is what the LORD, the God of Israel, says: I made a covenant with your ancestors when I brought them out of Egypt, out of the land of slavery. I said, ‘Every seventh year each of you must free any fellow Hebrews who have sold themselves to you. After they have served you six years, you must let them go free.’ Your ancestors, however, did not listen to me or pay attention to me.