Solomon
Proverbs 26:24ESV·traditional attribution

Whoever hates disguises himself with his lips and harbors deceit in his heart;

Matthew Henry Presbyterian @wholebiblehenry

There is cause to complain, not only of the want of sincerity in men's profession of friendship, and that they do not love so well as they pretend nor will serve their friends so much as they promise, but, which is much worse, of wicked designs in the profession of friendship, and the making of it subservient to the most malicious intentions.

Commenting on Proverbs 26:24-26

John Gill Reformed Baptist @doctorgill

When he speaketh fair, believe him not,.... Gives good words, flatters with his lips, pretends great kindness and favour, expresses himself in a very gracious and amiable manner, in order to gain attention and respect; or when he delivers himself in a submissive and suppliant way, with great humility and deference; or in a mournful and pitiful strain, as if he had the most tender...

Jamieson-Fausset-Brown Reformed @jfbcommentary

dissembleth--though an unusual sense of the word (compare Margin), is allowable, and better suits the context, which sets forth hypocrisy.