Matthew Poole and continuators on Jeremiah 34:18

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

This was a Ceremony which they used in making of Covenants, not without something of a warrant from a Divine President, Gen. 15.9, 10. it is said ver. 19. That same day the Lord made a Covenant with Abraham (that Covenant was a promise that Abrahams seed should possess the land of Canaan) ver. 8. Abraham said unto God whereby shall I know that I shall inherit it, ver. 9. God bids him take an hei[illegible: 1 letter]er of three years old, and a she goat of three years old, and a ram of three years old, &c. ver. 10. it is said, that he took them, and divided them in the midst, and laid each piece one against another. Indeed we read nothing there of the Parties covenanting, passing betwixt the parts of the Beasts so divided, but this was afterwards used in making Covenants betwixt men, which had in it a secret imprecation or wishing that they might be cut in pieces like those Beasts, if they did not keep the Covenants which they made. It should seem that these Iews in the making of their solemn Promise or Covenant with God about releasing their Servants used this rite; they cause a calf, or heifer to be cut in pieces, and the parts to be laid in the Temple right over one another, then they recited this Covenant, and in the way of a solemn promise, or confirmation of their resolution to make their promise good, they passed betwixt the parts of the Calf, or Heifer so cut, silently agreeing that God should cut them in pieces like that Beast if they did not make their words good. Hence is the Heb. phrase of cutting a covenant, for making it. This was a Ceremony ordinarily used also amongst the Heathens, as we are informed by Cicero, Li[illegible: 1 letter]y, and others.