Jeremiah 34:15-16

34:15 Recently, however, you yourselves showed a change of heart and did what is pleasing to me. You granted your fellow countrymen their freedom and you made a covenant to that effect in my presence in the house that I have claimed for my own. 34:16 But then you turned right around and showed that you did not honor me. Each of you took back your male and female slaves whom you had freed as they desired, and you forced them to be your slaves again.