Jeremiah 34:9-14

9That every man should release his male servant, and every man his female servant, being a Hebrew man or woman; that none should retain them in service, that is, a Jew his brother. 10Now when all the princes, and all the people, who had entered into the covenant, heard that every one should release his male servants, and every one his female servants, that none should retain them in service any more, then they obeyed, and let them go. 11But afterwards they turned, and caused the male and female servants, whom they had released to return, and brought them into subjection for male and female servants. 12Therefore the word of the LORD came to Jeremiah from the LORD, saying, 13Thus saith the LORD, the God of Israel; I made a covenant with your fathers in the day that I brought them forth from the land of Egypt, out of the house of bondage, saying, 14At the end of seven years release ye every man his brother an Hebrew, who hath been sold to thee; and when he hath served thee six years, thou shalt let him go free from thee: but your fathers hearkened not to me, neither inclined their ear.1