Revelation 10 shows us that it is God’s Messiah, Yeshua, who brings about the vengeance and recompense described in Deuteronomy 32 against those who have attacked and killed God’s servants. We see that at the end of time, both the Song of Moses and the Song of the Lamb will be known in those final days.
Revelation fortells of a time when those who trust completely in God and aren’t fooled by the beast, his image and the number of his name will sing “the song of Moses” and “the song of the Lamb” (Rev. 15:2–4).
We know of the “song of the Lamb” from Revelation 5. There’s the “song of Moshe” in Exodus 15 just after God saves Israel and destroys the Egyptian army in the Red Sea. There’s also another “song” of Moshe in Deuteronomy 32, and understanding it helps us understand apostle Paul’s terms “under [the] law” and “under grace.”
Seven shows up repeatedly in Scripture. It appears first with the seventh day of creation, threads through God’s cycles of appointments with mankind, and foreshadows the timing of Messiah Yeshua’s arrival as the Word become flesh and culminates with many of the symbols of the Day of the Lord.
Moses takes the time to sing God’s praises after they all went through the Red Sea in safety. They also faced their first test at Marah: Would Israel trust God completely or be bitter toward Him?