Charles Spurgeon Commentary Deuteronomy 32:1

"Give ear, ye heavens, and I will speak; And let the earth hear the words of my mouth." — Deuteronomy 32:1 (ASV)

Give ear, O you heavens, and I will speak; and hear, O earth, the words of my mouth.

Because people are so slow to hear, Moses calls on the heavens and the earth to bear witness against them; and because of the sublimity of his subject, he calls upon the heavens and the earth to pay attention to it.