Jeremiah 34:12

8 After King Zedekiah had made a covenant with all the people in Jerusalem to proclaim liberty, the word came to Jeremiah from the LORD

9 that each man should free his Hebrew slaves, both male and female, and no one should hold his fellow Jew in bondage.

10 So all the officials and all the people who entered into this covenant agreed that they would free their menservants and maidservants and no longer hold them in bondage. They obeyed and released them,

11 but later they changed their minds and took back the menservants and maidservants they had freed, and they forced them to become slaves again.

12 Then the word of the LORD came to Jeremiah from the LORD, saying,

13 “This is what the LORD, the God of Israel, says: I made a covenant with your forefathers when I brought them out of the land of Egypt, out of the house of slavery, saying:

14 Every seventh year, each of you must free his Hebrew brother who has sold himself to you. He may serve you six years, but then you must let him go free. But your fathers did not listen or incline their ear.

15 Recently you repented and did what pleased Me; each of you proclaimed freedom for his neighbor. You made a covenant before Me in the house that bears My Name.

16 But now you have changed your minds and profaned My name. Each of you has taken back the menservants and maidservants whom you had set at liberty to go wherever they wanted, and you have again forced them to be your slaves.

Read all of Jeremiah 34