Jeremiah 34:8-11

CKJV_Strongs(i)
  8 H1697 This is the word H3414 that came unto Jeremiah H3068 from the Lord, H310 after H4428 that the king H6667 Zedekiah H3772 had made H1285 a covenant H5971 with all the people H3389 which were at Jerusalem, H7121 to proclaim H1865 liberty unto them;
  9 H376 That every man H5650 should let his manservant, H376 and every man H8198 his maidservant, H5680 being a Hebrew H5680 or a Hebrewess, H7971 go H2670 free; H5647 that none should serve H3064 himself of them, to know, of a Jew H251 his brother.
  10 H8269 Now when all the princes, H5971 and all the people, H935 which had entered H1285 into the covenant, H8085 heard H376 that every one H5650 should let his manservant, H376 and every one H8198 his maidservant, H7971 go H2670 free, H5647 that none should serve H8085 themselves of them any more, then they obeyed, H7971 and let them go.
  11 H310 But afterward H7725 they turned, H5650 and caused the servants H8198 and the handmaids, H7971 whom they had let go H2670 free, H7725 to return, H3533 and brought them into subjection H5650 for servants H8198 and for handmaids.