When the boughs thereof are withered, they shall be broken off. By a sudden introduction of metaphor, the city becomes a tree, the prophet's thought going back, perhaps, to Isaiah 27:6. "Withered boughs" are indications of internal rottenness, and must be "broken off" to give the tree a chance of recovery. Samaria may be viewed as such a "bough," if the "tree" be taken as "the Israel of God" in the wider sense. Otherwise, we must suppose a threat against individual Judaeans. The women come. Weak women are strong enough to break off dead branches; they fall at a touch, and "their end is to be burned" (Hebrews 6:8). For it is a people of no understanding. It was folly, madness, to turn away from Jehovah, and go after other gods. Only through having "no understanding" could Israel have been so foolish (comp. Deuteronomy 32:28; 2 Kings 17:15; Jeremiah 4:22). He that made them … he that formed them (comp. Isaiah 43:1, Isaiah 43:7). God "hateth nothing that he has made" (Collect for Ash Wednesday). He made all men, but he "made" and "formed" Israel with exceptional care, and exceptional care leads on to exceptional love. Will not have mercy … will show them no favor; i.e. "will not spare." No contradiction of Isaiah 27:7, Isaiah 27:8 is intended. God will have "measure" and "mercy" in his punishment of Israel, but will not so have mercy as not to punish severely.
JUDAH PROMISED RESTORATION. The general practice of Isaiah is to append to gloomy prophecies words of encouragement He does this even when heathen nations are denounced (Isaiah 18:7; Isaiah 19:18-25; Isaiah 23:17, Isaiah 23:18); and still more when he is predicting judgments upon Israel (Isaiah 2:2-4; Isaiah 6:13; Isaiah 10:20-34; Isaiah 24:23; Isaiah 29:18-24, etc.). The encouragement in this place is a promise of return after dispersion, and of re-establishment on the "holy mount at Jerusalem" (verse 19).