Jeremiah 34:7-9

American Standard Version

⁷ when the king of Babylon’s army was fighting against Jerusalem, and against all the cities of Judah that were left, against Lachish and against Azekah; for these alone remained of the cities of Judah as fortified cities.

⁸ The word that came unto Jeremiah from Jehovah, after that the king Zedekiah had made a covenant with all the people that were at Jerusalem, to proclaim liberty unto them; ⁹ that every man should let his man-servant, and every man his maid-servant, that is a Hebrew or a Hebrewess, go free; that none should make bondmen of them, to wit, of a Jew his brother.