29 There will be a song for you as at night when a holy festival is kept, and a gladness of heart like one who goes with the flute, to go to the mountain of Yahveh, to the rock of Israel. 30 And Yahveh will cause the majesty of his voice to be heard, and he will cause the lowering of his arm to be seen, in furious anger and a flame of devouring fire, a cloudburst and a rainstorm and a storm of hail. 31 Indeed, Assyria will be shattered by the voice of Yahveh; he strikes with the rod. 32 And every strike of foundation staff that Yahveh lays will be on it with drums and lyres, and he will fight against it with battles, showing off his strength. 33 Because Topheth was already prepared yesterday; indeed, it is made ready for the king. He makes its pile of wood deep and wide; he stockpiles fire and wood. The breath of Yahveh burns on it like a stream of sulfur.
his voice and his arm
Topheth was a place where sacrifices were made, and became a symbol for the ultimate destruction of God’s enemies. David Guzik writes, “The Valley of Hinnom served as Jerusalem’s garbage dump, and the combination of disgusting rubbish and smouldering fires made it a picture of hell. The Hebrew word for hell (gehenna) comes from the word for the Valley of Hinnom. Therefore, God says He has a special place in hell for the Assyrian king!” That king did not have to wait until the universal judgment to experience that hell. He lost 185,000 of his men in one night, fled back home, and was assassinated by his own sons as he worshipped in the temple of his god, Nisroch.
In one fell swoop, the sound of the LORD’s voice and the lowering of his arm gained victory for the Israelites. This does not always happen. Sometimes the enemy wins. But even when the enem.y seems to be winning in our lives, we can have a song in the night. Because judgment day is coming, and no enemy will be able to resist that.
LORD, we will sing even in the darkest of nights, because your voice will be heard, and your arm will lower to destroy all your enemies
 Guzik, David. “Commentary on Isaiah 30:1”. “David Guzik Commentaries on the Bible”. http://www.studylight.org/commentaries/guz/view.cgi?bk=22&ch=30. 1997-2003.