Job 18:13

The strength of his skin, Heb. the bars, or rather, the branches of the skin, i.e. either the veins and sinews, which branch out themselves through the skin as well as elsewhere; or the fat and flesh, which like bars support the skin, and adorn and beautify it, as branches do a tree; without which the skirt is shrivelled up and deformed. The first-born of death, i.e. a most remarkable and terrible kind of death. The first-born was the chief of his brethren, and therefore this title is given to things eminent in their kind, as Isaiah 14:30 Colossians 1:18 Hebrews 12:23 Revelation 1:5.