John Gills Exposition of the Bible Commentary - Proverbs 18:6
A fool's lips enter into contention ,.... That is, between others, when he has nothing to do with it; but he must be meddling, and make himself a party in the contention, which is an argument of his folly; he says things which occasion disputes, raise contentions among men, and provoke to wrath and anger. The Septuagint version is, "the lips of a fool lead him to evils": for, as they lead him to contention and strife, the issue of that is confusion and every evil work; and his mouth... read more
Matthew Henry's Complete Commentary - Proverbs 18:6-7
Solomon has often shown what mischief bad men do to others with their ungoverned tongues; here he shows what mischief they do to themselves. 1. They embroil themselves in quarrels: A fool's lips, without any cause or call, enter into contention, by advancing foolish notions which others find themselves obliged to oppose, and so a quarrel is begun, or by giving provoking language, which will be resented, and satisfaction demanded, or by setting men at defiance, and bidding them do if they dare.... read more