Jeremiah 34:15-16

A short time ago you changed your hearts and did what I say is right. Each of you gave freedom to his fellow Hebrews who were slaves. And you even made an agreement before me in the place where I have chosen to be worshiped. But now you have changed your minds. You have shown you do not honor me. Each of you has taken back the male and female slaves you had set free, and you have forced them to become your slaves again.