Isaiah 31 Defending He Will Deliver, Passing Over He Will Preserve.
There is only woe for those who trust in humanity in opposition to the LORD, the Holy One of Israel (v. 1 Cf. 9:13; Dan. 9:13; Amos 5:4b). His words against evildoers will not be called back (v. 2 Cf. Nu. 23:19). Egypt and those who put their trust in them, together would fall (v. 3 Cf. 20:6). The LORD would roar like a lion (v. 4 Cf. Nu. 24:9; Amos 3:8; Hos. 11:10). “So will the LORD of hosts defend Jerusalem. Defending, He will also deliver it; passing over, He will preserve it” (v. 5 Cf. Ps. 94:1). The church of Jesus Christ is the new Jerusalem, in continuity with the people of God from Adam (Heb. 12:22-24). In defending his church, he will also deliver it, and in passing over it, he will preserve it.
It is no coincidence that the LORD is described as passing over it, for Jesus is our Passover (I Cor. 5:7 Cf. Ex. 12:1-28). When Jesus broke bread before the offering up of himself for his people, the bread and wine of the Passover became what they always were-the flesh and blood of the Lamb of God (Mt. 26:17-25; Mk. 14:12-21; Lk. 22:14-23). Isaiah issues a call to repentance, which meant casting off their idols of silver and gold (vv. 6-7 Cf. 2:20; 30:22; I Kgs. 12:30). Assyria would fall by a sword and flee from it, but one not of man, and their young men would become forced labour (v. 8). That sword was the word of the prophet, from the LORD-a fire and a furnace stoked in Zion, in Jerusalem (v. 9 Cf. Heb. 4:12).