Keil & Delitzsch, on Prov 21:23

“He that keepeth his mouth and his tongue, keepeth his soul from distress.”

“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. The troubles comprehend both external and internal evils, hurtful incidents and (נפשׁ) צרות לבב, Psa 25:17; Psa 31:8, i.e., distress of conscience, self-accusation, sorrow on account of the irreparable evil which one occasions.”

Imported from an open dataset — not yet checked against the printed edition.