4. Concerning Edom, the posterity of Esau. (1.) Their peculiar sin was an unmerciful, unwearied, pursuit of the people of God, and their taking all advantages against them to do them a mischief, v. 11. He did pursue his brother with the sword, not only of old, when the king of Edom took up arms to oppose the children of Israel's passage through his border (Num. xx. 18), but ever since upon all occasions; they had not strength and courage enough to face them in the field of battle, but, whenever any other enemy had put Judah or Israel to flight, then the Edomites set in with the pursuers, fell upon the rear, slew those that were half dead already, and (as is usual with cowards when they have an enemy at an advantage) they did cast off all pity. Those that are least courageous are commonly most cruel. Edom was so; his malice destroyed his compassion (so the word is); he stripped himself of the tenderness of a man, and put on the fierceness of a beast of prey; and, as such a one, he did tear, his anger did tear perpetually. His cruelty was insatiable, and he never knew when he had sucked enough of the blood of Israel, but, like the horse-leech, still cried, Give, give. Nay, he kept his wrath for ever; when he wanted objects of his wrath, and opportunity to show it, yet he kept it in reserve (it rested in his bosom), he rolled it under his tongue as a sweet morsel, and had it ready to spit in the face of Israel upon the next occasion. Cursed be such cruel wrath, and anger so fierce, so outrageous, which makes men like the devil, who continually seeks to devour, and unlike to God, who keeps not his anger for ever. Edom's malice was unnatural, for thus he pursued his brother, whom he ought to have protected: it was hereditary, as if it had been entailed upon the family ever since Esau hated Jacob, and time itself could not wear it out, no, nor the brotherly conduct of Israel towards them (Deut. ii. 4), and the express law given to Israel (Deut. xxiii. 7), Thou shalt not abhor an Edomite, for he is thy brother. (2.) Here is nothing peculiar in their punishment; but (v. 12) a fire shall be sent to devour their palaces. Note, The fire of our anger against our brethren kindles the fire of God's anger against us.