“Give ear, ye heavens, and I will speak; and let the earth hear the words of my mouth.”
– Deuteronomy 32:1, JPS 1917 Tanach
As Moshe prepares to pass on his leadership to Joshua, he focuses on the conclusion of his speech to B’nei Yisrael. H’Shem explains to Moshe that at some point after being established in Eretz Canaan, on the other side of the Jordan River – the land that will be called Eretz Yisrael – the people will “go astray after the foreign gods of the land, whither they go to be among them, and will forsake Me, and break My covenant which I have made with them” (Deuteronomy 31:16, JPS). Therefore, H’Shem instructs Moshe to teach them a song – to be remembered – that will serve as a witness against them in future generations.
Moshe calls upon the heavens and the earth to serve as witnesses, since they will outlast the generations, always serving to remind Israel of this song. On another level, according to Rashi, the heavens and earth would actually play an active role in chastising Israel – the nourishing rains of the heavens would diminish, and the produce of the earth would be withheld. On a more subtle note, not only the words of this song reverberate throughout the heaven and earth; even H’Shem’s words, intent and guidance span the continents and the skies, reaching out to all who will listen intently for His voice.