They use what God has given them to sing a song of victory and praise. The song of Moses was sung to rejoice over Israel's deliverance from the Egyptians through the Red Sea. Pharaoh's army had been drowned in the sea and God would bring his people to their promised inheritance. (Exodus 15:1-21) The song of the Lamb would be one of triumph in salvation and over all the evil Satan and his forces had brought against them. Since both songs are sung, it may be these are the redeemed of both covenants. Appropriately, God is given all the praise for the victory. A better rendering at the end of this verse would either make God king of ages or nations, as in the margin.

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