John Gills Exposition of the Bible Commentary - Proverbs 25:18
A man that beareth false witness against his neighbour ,.... In whose house he has often been, and whom he has frequently visited; and, observing what was done there, not only discovers and tells abroad the secrets of his family, but even things which are false; yea, in a court of judicature, appears a witness against him, and swears falsely to his hurt and prejudice. Such a man is a maul, and a sword, and a sharp arrow ; that is, to his neighbour, against whom he bears false witness;... read more
Matthew Henry's Complete Commentary - Proverbs 25:18
Here, 1. The sin condemned is bearing false witness against our neighbour, either in judgment or in common conversation, contrary to the law of the ninth commandment. 2. That which it is here condemned for is the mischievousness of it; it is in its power to ruin not only men's reputation, but their lives, estates, families, all that is dear to them. A false testimony is every thing that is dangerous; it is a maul (or club to knock a man's brains out with), a flail, which there is no fence... read more