Moses
Deuteronomy 32:5BSB·traditional attribution

His people have acted corruptly toward Him; the blemish on them is not that of His children, but of a perverse and crooked generation.

John Calvin Reformed

5. They have corrupted themselves. Moses now inveighs unhesitatingly against the perfidy of the people, and gives loose to the most unmeasured upbraidings; for if God be just and true, then it was plain enough that the Israelites were a depraved and perverse nation.

Matthew Henry Presbyterian

Here is, I. A commanding preface or introduction to this song of Moses, Deu 32:1, Deu 32:2. He begins, 1. With a solemn appeal to heaven and earth concerning the truth and importance of what he was about to say, and the justice of the divine proceedings against a rebellious and backsliding people, for he had said (Deu 31:28) that he would in this song...

Commenting on Deuteronomy 32:1-6

John Gill Reformed Baptist

They have corrupted themselves,.... This and what follows may seem to be the characters of the enemies of Christ, who lightly esteemed and rejected him, set in a contrast with him; who were not only corrupt by nature, as all men are, but were men of corrupt minds in their tenets and principles; who corrupted the word of God by their traditions, in the times...