Jeremiah 34:11-14 New American Bible, Revised Edition (NABRE)

11. afterward they took back their male and female servants whom they had set free and again forced them into servitude.

12. Then this word of the Lord came to Jeremiah:

13. Thus says the Lord, the God of Israel: I myself made a covenant with your ancestors the day I brought them out of the land of Egypt, out of the house of slavery:

14. Every seventh year each of you must set free all Hebrews who have sold themselves to you; six years they shall serve you, but then you shall let them go free. Your ancestors, however, did not listen to me or obey me.

Jeremiah 34