Matthew Poole and continuators on Proverbs 24:9

9. The thought of foolishness is sin : and the scorner is an abomination to men .

The very inward thought or contrivance of evil, of which he spake, v. 8. even before it break forth into action, is a sin in God's sight, and it is hateful to God. Or, foolishness is put for foolish or wicked men, by comparing this with the next clause where the scorner is opposed to it. So the sense is, All the Thoughts of wicked men are onely evil and that continually, as is said of man in his corrupt estate, Gen. 6. 5. and therefore abominable to God.

He who not onely deviseth and practiseth wickedness, but obstinately persists in it, and rejects all admonitions against it.

Is abominable not onely to God, as all sinners are, but to all sober men.

Marginal references: Or, but.