Jeremiah 34:18

"And I will give the men that have transgressed my covenant, which have not performed the words of the covenant which they made before me, when they cut the calf in twain and passed between the parts thereof."

For more on the nature of the covenant here, see under Jeremiah 34:8,10 above. It was the kind of covenant that God made with Abraham in Genesis 15:10ff, in which birds and/or animals were divided, and the parties of the covenant passed between the divided portions of the creatures that had been slain. The implication was that any violator would deserve to suffer the same fate of the animals or birds used in the ceremony. Here it was a calf that had been cut in twain.

The prophet here enumerated the men who had thus violated the solemn covenant. The list given in the next verses included practically all the leaders of the nation, even that of the king himself and his princes.