Behold, {z} the name of the LORD cometh from far, burning with his anger, and the burden of it is heavy: his lips are full of indignation, and his tongue as a devouring fire:

(z) This threatening is against the Assyrians the chief enemies of the people of God.

Wesley's Notes

30:27 Behold - Here he gives them an earnest of those greater mercies in times to come, by assuring them of the approaching destruction of the Assyrian forces. The name - The Lord himself. From far - From a remote place: even from heaven. Heavy - He will inflict heavy judgments upon them. Indignation - He hath pronounced a severe sentence against them, and will give command for the execution of it.

King James Translators' Notes

burden...: or, grievousness of flame

heavy: Heb. heaviness

Scofield Reference Notes

[1] Behold

The imagery of Isa 30:27,28 is cumulative. Judah is making an alliance with Egypt when she might be in league with Him whose judgment upon the world-powers will be like a terrible thunder-tempest (v.27), turning streams into torrents neck-deep (v. 28, f.c.); who will sift the nations in their own sieve of vanity (or "destruction"), and put His bridle into the jaws of the peoples.

Jamieson-Fausset-Brown Bible Commentary

27. name of . Lord-that is, Jehovah Himself (Ps 44:5; 54:1); represented as a storm approaching and ready to burst over the Assyrians (Isa 30:30, 31).

burden . is heavy-literally, "grievousness is the flame," that is, the flame which darts from Him is grievous. Or else (as the Hebrew means an "uplifting") the uprising cloud is grievous [G. V. Smith]; the gathering cloud gradually rising till it bursts.

Matthew Henry's Concise Commentary

30:27-33 God curbs and restrains from doing mischief. With a word he guides his people into the right way, but with a bridle he turns his enemies upon their own ruin. Here, in threatening the ruin of Sennacherib's army, the prophet points at the final and everlasting destruction of all impenitent sinners. Tophet was a valley near Jerusalem, where fires were continually burning to destroy things that were hurtful and offensive, and there the idolatrous Jews caused their children to pass through the fire to Moloch. This denotes the certainty of the destruction, as an awful emblem of the place of torment in the other world. No oppressor shall escape the Divine wrath. Let sinners then flee to Christ, seeking to be reconciled to Him, that they may be safe and happy, when destruction from the Almighty shall sweep away all the workers of iniquity.