Solomon
Proverbs 29:12ESV·traditional attribution

If a ruler listens to falsehood, all his officials will be wicked.

Matthew Henry Presbyterian @wholebiblehenry

Note, 1. It is a great sin in any, especially in rulers, to hearken to lies; for thereby they not only give a wrong judgment themselves of persons and things, according to the lies they give credit to, but they encourage others to give wrong informations. Lies will be told to those that will hearken to them; but the receiver, in this case, is as bad as the thief. 2.

John Gill Reformed Baptist @doctorgill

If a ruler hearken to lies,.... To men that tell them in order to soothe and flatter him, or to hurt the character and reputation of others, that they may raise their own: rulers should not listen to and encourage such sort of persons; for, as lying lips do not become a prince, so it is not right to have liars about him; David would...

Keil & Delitzsch Lutheran @keilanddelitzsch

Pro 29:12 12 A ruler who listens to deceitful words, All his servants are godless. They are so because they deceive him, and they become so; for instead of saying the truth which the ruler does not wish to hear, they seek to gain his favour by deceitful flatteries, misrepresentations, exaggerations, falsehoods. Audita rex quae praecipit lex.