Moses
Deuteronomy 29:20ESV·traditional attribution

The LORD will not be willing to forgive him, but rather the anger of the LORD and his jealousy will smoke against that man, and the curses written in this book will settle upon him, and the LORD will blot out his name from under heaven.

John Calvin Reformed @genevareformer

20. The Lord will not spare him. Moses here teaches us that the obstinacy in which the wicked are willfully hardened, shuts against them the door of hope, so that they will find that God is not to be appeased.

Matthew Henry Presbyterian @wholebiblehenry

It appears by the length of the sentences here, and by the copiousness and pungency of the expressions, that Moses, now that he was drawing near to the close of his discourse, was very warm and zealous, and very desirous to impress what he said upon the minds of this unthinking people.

Commenting on Deuteronomy 29:10-29

John Gill Reformed Baptist @doctorgill

And the Lord shall separate him unto evil out of all the tribes of Israel,.... Unto the evil of punishment, devote and consign him to it, and make him a visible and distinguished mark of his displeasure and vengeance. So some men are righteously separated from others, and preordained unto condemnation, being wicked and ungodly men; for such God has made or appointed for the...