39 See now, I myself am he; there is no other god but me: giver of death and life, wounding and making well: and no one has power to make you free from my hand. 40 For lifting up my hand to heaven I say, By my unending life, 41 If I make sharp my shining sword, and my hand is outstretched for judging, I will give punishment to those who are against me, and their right reward to my haters. 42 I will make my arrows red with blood, my sword will be feasting on flesh, with the blood of the dead and the prisoners, of the long-haired heads of my haters. 43 Be glad, O you his people, over the nations; for he will take payment for the blood of his servants, and will give punishment to his haters, and take away the sin of his land, for his people.

Matthew Henry's Commentary on Deuteronomy 32:39-43

Commentary on Deuteronomy 32:39-43

(Read Deuteronomy 32:39-43)

This conclusion of the song speaks, 1. Glory to God. No escape can be made from his power. 2. It speaks terror to his enemies. Terror indeed to those who hate him. The wrath of God is here revealed from heaven against them. 3. It speaks comfort to his own people. The song concludes with words of joy. Whatever judgments are brought upon sinners, it shall go well with the people of God.