2 My doctrine shall drop as the rain.
My speech shall condense as the dew,
as the small rain on the tender grass,
as the showers on the herb.

Matthew Henry's Commentary on Deuteronomy 32:2

Commentary on Deuteronomy 32:1-2

(Read Deuteronomy 32:1-2)

Moses begins with a solemn appeal to heaven and earth, concerning the truth and importance of what he was about to say. His doctrine is the gospel, the speech of God, the doctrine of Christ; the doctrine of grace and mercy through him, and of life and salvation by him.