Jeremiah 34:7-11

Rotherham(i) 7 when, the force of the king of Babylon, was fighting against Jerusalem, and against all the cities of Judah that were left,––against Lachish and against Azekah, for, they, remained among the cities of Judah, as fortified cities.
8 The word which came unto Jeremiah, from Yahweh,––after that King Zedekiah had solemnised a covenant with all the people who were in Jerusalem, proclaiming unto them, liberty: 9 that every man should let his servant and every man his handmaid, being a Hebrew or a Hebrewess, go free,––so that no man should use them as slaves, to wit a Jew his brother; 10 so then they hearkened––even all the princes and all the people who had entered into the covenant, that every man should let his servant and every man his handmaid, go free, so as not to use them as slaves, any longer,––yea they hearkened, and let them go, 11 howbeit they turned, after that, and brought back the servants and the handmaids whom they had let go, free, and brought them into subjection as servants and as handmaids.