Isaiah 30:29-31

Ye shall have a song, &c. You shall have occasion of great joy, and of singing songs of praise for your stupendous deliverance from that formidable enemy; as in the night, &c. He mentions the night, either because the Jewish feasts began in the evening, and were celebrated with great joy during a part of the night, as well as on the following day; or because he has a particular respect to the solemnity of the passover, in which they spent some considerable part of the night in rejoicing, and singing sacred songs before the Lord. As when one goeth, &c. Like the joy of one that is going up to the solemn feasts with music. The Lord shall cause his glorious voice to be heard His thunder, metaphorically taken for a terrible judgment. “This destruction shall be from the immediate hand of God, in which he shall as evidently appear as if he had discomfited the army by a tempest of thunder, and lightning, and hail-stones, as he formerly destroyed the Canaanites and Philistines.” Lowth. And show the lighting down of his arm Upon the Assyrian, whom he will smite with a deadly blow in the face of the world; with the indignation of his anger With great wrath; which is signified by heaping so many words of the same signification together. The Assyrian, who smote with a rod Who was the rod wherewith God smote his people and other nations: he who used to smite others shall now be smitten himself.