Isaiah 34:5-8
Isaiah 34:1 - 17
NASB - 1 Draw near, O nations, to hear; and listen, O peoples! Let the earth and all it contains hear, and the world and all that springs from it. 2 For the LORD'S indignation is against all the nations, And His wrath against all their armies; He has utterly destroyed them, He has given them over to slaughter.
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Sounds like a sword hot with slaughter in my opinion. What would a sword look like, if it was used in a mass slaughter? I would assume it would be covered in blood, fat and everything else that comes from war and killing.