Jeremiah 34:5-10
English Standard Version
6Then Jeremiah the prophet spoke all these words to Zedekiah king of Judah, in Jerusalem,
7when the army of the king of Babylon was fighting against Jerusalem and against all the cities of Judah that were left, Lachish and Azekah, for these were the only fortified cities of Judah that remained.
8The word that came to Jeremiah from the Lord, after King Zedekiah had made a covenant with all the people in Jerusalem to make a proclamation of liberty to them,
9that everyone should set free his Hebrew slaves, male and female, so that no one should enslave a Jew, his brother.
10And they obeyed, all the officials and all the people who had entered into the covenant that everyone would set free his slave, male or female, so that they would not be enslaved again. They obeyed and set them free.