Westminster Shorter Catechism

Q56

What is the reason annexed to the third commandment?

The reason annexed to the third commandment is, that however the breakers of this commandment may escape punishment from men, yet the Lord our God will not suffer them to escape his righteous judgment140.
Duty
Ch. XXII Of Lawful Oaths and Vows

Scripture Proofs

140
Deuteronomy 28:58-591 Samuel 3:131 Samuel 4:11