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The words used in Jeremiah 34:18-19, “cut the calf in twain,” allude to the custom of dividing a sacrifice into two parts, between which the parties ratifying a covenant passed (Genesis 15:9-10, 17-18).
Ages after this, Jeroboam, king of Israel, set up two idol calves, one at Dan, and the other at Bethel, that he might thus prevent the ten tribes from resorting to Jerusalem for worship (1 Kings 12:28). These calves continued to be a snare to the people till the time of their captivity.
The calf at Dan was carried away in the reign of Pekah by Tiglath-pileser, and that at Bethel ten years later, in the reign of Hoshea, by Shalmaneser (2 Kings 15:29; 17:33). This sin of Jeroboam is almost always mentioned along with his name (2 Kings 15:28, etc.).