Deut 31:19 commands to write and teach this song as a witness — here Moses fulfills that command by reciting it, showing obedience to God's instruction.

Deut 32:44 recounts Moses reciting the song with Joshua — a parallel account of the same event, confirming the public proclamation.

In Deut 4:5, Moses teaches God's statutes — this earlier commission parallels his delivering the song, both showing Moses as faithful teacher of God's words.

Revelation 15:3 explicitly mentions the song of Moses being sung in heaven — this connects the OT song to eschatological worship, showing its enduring significance.