The bearing of false witness is forbidden, but this must not be limited merely to testimony given in the law court or under oath. Isn’t it a condemnation that men have to be put under oath in order to make sure of their speaking the truth? As a legal offence, perjury—the bearing of false witness when under oath—is one of the most serious crimes that can be committed. Nearly every civilized nation visits it with heavy punishment. Unless promptly checked, it would shake the very foundations of justice.

Lying—uttering or acting falsehood—and slander—the spreading of false reports tending to destroy the reputation of another—are two of the most common violations of this commandment.