Commentaries:
Jamieson, Fausset, and Brown
passed between the parts thereof—The contracting parties in the "covenant" (not here the law in general, but their covenant made before God in His house to emancipate their slaves, Jeremiah 34:8-9) passed through the parts of the animal cut in two, implying that they prayed so to be cut in sunder (Matthew 24:51; Greek, "cut in two") if they should break the covenant (Genesis 15:10, Genesis 15:17).
Other Jamieson, Fausset, and Brown entries containing Jeremiah 34:18:
Jeremiah 33:26
Jeremiah 34:8
Jeremiah 34:20
Lamentations 1:3
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