Charles Ellicott Commentary Deuteronomy 31:30

"And Moses spake in the ears of all the assembly of Israel the words of this song, until they were finished." — Deuteronomy 31:30 (ASV)

And Moses spoke ... the words of this song. —The exodus of Israel begins and ends with a song of Moses. The song of Exodus 15 is usually referred to as the “Song of Moses,” and is thought to be intended in Revelation 15:3-4. But there is a remarkable resemblance between Revelation 15:3 and Deuteronomy 32:3-4 (compare these passages).