Solomon
Proverbs 21:23ESV·traditional attribution

Whoever keeps his mouth and his tongue keeps himself out of trouble.

Matthew Henry Presbyterian @wholebiblehenry

Note, 1. It is our great concern to keep our souls from straits, being entangled in snares and perplexities, and disquieted with troubles, that we may preserve the possession and enjoyment of ourselves and that our souls may be in frame for the service of God. 2.

John Gill Reformed Baptist @doctorgill

Whoso keepeth his mouth and his tongue,.... Guards the one and bridles the other; is careful of what he says, that it is truth, and without dissimulation and guile; and is not injurious to the characters of men, and is not offensive and provoking; who abstains from ill and wrathful language, and which tends to stir up wrath and contention.

Keil & Delitzsch Lutheran @keilanddelitzsch

Pro 21:23 23 He that guardeth his mouth and his tongue, Keepeth his soul from troubles. Pro 13:3 resembles this. He guardeth his mouth who does not speak when he does better to be silent; and he guardeth his tongue who says no more than is right and fitting.