Charles Spurgeon Commentary Deuteronomy 29:20-21

"Jehovah will not pardon him, but then the anger of Jehovah and his jealousy will smoke against that man, and all the curse that is written in this book shall lie upon him, and Jehovah will blot out his name from under heaven. And Jehovah will set him apart unto evil out of all the tribes of Israel, according to all the curses of the covenant that is written in this book of the law." — Deuteronomy 29:20-21 (ASV)

And the LORD shall blot out his name from under heaven.

And the LORD shall separate him unto evil out of all the tribes of Israel,

As a huntsman separates a stag from the herd so that he may hunt it all day, so shall God separate any idolater who should come among His people, with whom He made a covenant that day.

Oh, how God hates that anything should be worshipped by us except Himself: how indignant He is if anything, anywhere, takes the supreme place in the human heart that ought to be occupied by God alone.