Proverbs 25:18 (BSB)

Like a club or sword or sharp arrow is a man who bears false witness against his neighbor.

From Proverbs 25. Also in the ESV.

Commentary on Proverbs 25:18

• Matthew Henry (Presbyterian), Matthew Henry's Complete Commentary on 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.
• John Gill (Reformed Baptist), Exposition of the Old and New Testaments on 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.
• Jamieson-Fausset-Brown (Reformed), Commentary Critical and Explanatory on the Whole Bible on Proverbs 25:18: A false witness is as destructive to reputation, as such weapons to the body (Pro 24:28). beareth . . . witness--literally, "answereth questions," as before a judge, against his neighbor.
• Keil & Delitzsch (Lutheran), Biblical Commentary on the Old Testament on Proverbs 25:18: Pro 25:18 18 A hammer, and a sword, and a sharp arrow - A man that beareth false witness against his neighbour. An emblematic, or, as we might also say, an iconological proverb; for 18a is a quodlibet of instruments of murder, and 18b is the subscription under it: that which these weapons of murder accomplish, is done to his neighbour by a man who...