Solomon
Proverbs 29:27ESV·traditional attribution

An unjust man is an abomination to the righteous, but one whose way is straight is an abomination to the wicked.

Matthew Henry Presbyterian @wholebiblehenry

This expresses not only the innate contrariety that there is between virtue and vice, as between light and darkness, fire and water, but the old enmity that has always been between the seed of the woman and the seed of the serpent, Gen 3:15. 1. All that are sanctified have a rooted antipathy to wickedness and wicked people.

John Gill Reformed Baptist @doctorgill

An unjust man is an abomination to the just,.... Not his person, but his actions, his unrighteous actions, his ungodly life and conversation; which a man, holy, just, and good, loathes and abhors, and cannot forbear expressing his abhorrence of; and therefore shuns his company, and will have no fellowship with him.

Jamieson-Fausset-Brown Reformed @jfbcommentary

(Compare Pro 3:32). On last clause, compare Pro 29:16; Psa 37:12. Next: Proverbs Chapter 30