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 against; it is a sword to wound near at hand and a sharp arrow to wound at a distance; we have therefore need to pray, Deliver my soul, O Lord! from lying lips, Psa 120:2.

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; and, by so doing, he mauls his fame, his credit, character, and reputation; and, as with a sword, takes away his life; and against whom there is no more guarding than against a sharp arrow, that comes from afar, suddenly and swiftly.

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.