Jeremiah 34:17-18

17So I, the Lord, tell you this: You have not obeyed me. You have not let your Israelite slaves become free men and women. So now I will make you free! Yes, you will be free to let war, famine or disease kill you. People of all the kingdoms in the world will see how disgusting you are.

18I will punish the people who did not obey the agreement that they made with me. When they made that agreement, they cut a young cow into two pieces and they walked between the pieces. Because they have not obeyed their agreement, I will now cut them into pieces, like the young cow.