Jeremiah 34:14-17
34:14 “Every seven years each of you must free any fellow Hebrews who have sold themselves to you. After they have served you for six years, you shall set them free.” But your ancestors did not obey me or pay any attention to me.
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.
34:17 So I, the Lord, say: “You have not really obeyed me and granted freedom to your neighbor and fellow countryman. Therefore, I will grant you freedom, the freedom to die in war, or by starvation or disease. I, the Lord, affirm it! I will make all the kingdoms of the earth horrified at what happens to you.