Jeremiah 34:8-10

Amplified Bible

⁸ The word came to Jeremiah from the Lord after King Zedekiah had made a covenant (solemn pledge) with all the [Hebrew] people who were [slaves] in Jerusalem to proclaim liberty to them: ⁹ that every man should let his Hebrew slaves, male and female, go free, so that no one should make a slave of a Jew, his brother. ¹⁰ So all the princes and all the people who had entered into the covenant agreed that everyone would let his male servant and his female servant go free, and that no one would keep them in bondage any longer; they obeyed, and set them free.