A man that beareth false witness against his neighbor is a maul, and a sword, and a sharp arrow.
– Proverbs 25:18
Verses 18-20 are a group of verses with a loose connection rather than a more formal, topical one. These sayings use vivid imagery and you could loosely group them together around the theme of unreliability. This verse warns of the danger of a false witness. False witnesses are compared to a maul, a sword, and a sharp arrow. These are all deadly weapons designed to inflict damage, pain, and even death. False witness is likewise a deadly weapon and the wielder is not trustworthy.