Thus says the LORD;
For three transgressions of Edom, and for four, I will not turn away its punishment; because he did pursue his brother with the sword, and did cast off all pity, and his anger did tear perpetually, and he kept his wrath forever:
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George Leo Haydock
Sword. Edom was subdued by David, and remained tributary till Joram. It attempted to recover its liberty under Josaphat, though the Hebrew text have improperly Aram, 2 Paralipomenon xx. 2, 23. The two nations were often at variance. (Calmet)
Cast off. Septuagint, "violated the womb, or the mother on the earth."