Moses
Deuteronomy 30:17ESV·traditional attribution

But if your heart turns away, and you will not hear, but are drawn away to worship other gods and serve them,

Matthew Henry Presbyterian @wholebiblehenry

Moses here concludes with a very bright light, and a very strong fire, that, if possible, what he had been preaching of might find entrance into the understanding and affections of this unthinking people. What could be said more moving, and more likely to make deep and lasting impressions?

Commenting on Deuteronomy 30:15-20

John Gill Reformed Baptist @doctorgill

But if thine heart turn away,.... From the true God, and the right worship of him, and from his commands, statutes, and judgments: so that thou wilt not hear; the voice of the Lord and obey it, or hearken to his laws, and do them: but shalt be drawn away; by an evil heart, and by the ill examples of others: and worship other gods...

Jamieson-Fausset-Brown Reformed @jfbcommentary

DEATH AND LIFE ARE SET BEFORE THE ISRAELITES. (Deu 30:15-20) See, I have set before thee this day life and good, and death and evil--the alternative of a good and happy, or a disobedient and miserable life. Love of God and compliance with His will are the only ways of securing the blessings and avoiding the evils described.

Commenting on Deuteronomy 30:15-20