Deuteronómio 31:30 Comentario: Chizkuni, Sforno & Rabbeinu Bahya

את דברי השירה הזאת, “the words of this song;” this is a reference to the next portion, Haazinu, the major part of which consists of Moses’ parting song/poem to his nation. The subject is that G-d had provided for them in the desert as well as in the land of Israel, and how in spite of this they would forsake Him and be exiled, until eventually they would be redeemed from exile.

את דברי השירה הזאת עד תומם, including 32,36 כי ידין and כי אשא in 32,40, although those verses are not strictly speaking, part of Moses’ warning and testimony.

את דברי השירה הזאת עד תומם, “the words of this song until their conclusion.” This is a reference to the song Haazinu which commences with the next verse. Seeing that Moses referred to his speech as a שירה, “song or poem,” this is the reason that it must always be written and read in the manner one writes and reads a poem.