Deuteronomy 31:30 meaning

Though this verse is part of Chapter 31, it serves as introduction to the song God gave to Moses in the next chapter (Deuteronomy 32:1-43). The narrator tells the reader that Moses spoke in the hearing of all the assembly of Israel the words of this song, until they were complete (v. 30).

Earlier in this chapter, the Suzerain (Ruler) God commanded Moses to write a song that would be passed down through the generations (see v. 19). So, Moses obeyed the voice of the LORD and spoke the words of this song in the hearing of all the assembly of Israel, that is, the entire nation. He carefully followed God's command and recited all the words of the song until they were complete. Thus, the song would serve the function intended by its author (God): to serve as a future witness against Israel when they disobeyed and broke God's covenantal laws.