This commandment strikes at the heart of falsehood and lies, which in their turn are the native language of the devil. Without truth and trust, biblical culture is an impossibility. “You shall not bear false witness against your neighbor” (Ex. 20:16).
First, what is the context of false witness? The commandment prohibits lying against one’s neighbor. Paul tells the Colossians not to lie to one another, because they had put off the old man with his deeds (3:9). Trust is essential to all community, and false witness makes trust impossible. False witness can exist in such a society, but if it is not punished severely that society will not be a society long. At its base, deception is an act of war — “A man who bears false witness against his neighbor is like a club, a sword, and a sharp arrow (Prov. 25:18; cf. 12:17–18). The psalmist recognizes this — “false witnesses have risen against me, and such as breathe out violence” (Ps. 27:12).
Bearing false witness is therefore civil war — warfare against one’s neighbor, one’s brother. It is an act of violence directed against someone with whom you should be at peace.