Roman Catechism 25.46

Chapter 25 — Part III: The Decalogue — The Second Commandment

Section 46. Irreverent Speech — Scripture when it prohibits perjury, says: Thou shalt not profane the name of thy God, thereby forbidding all irreverence towards all other things to which, in accordance with this Commandment, reverence is due. Of this nature is the Word of God, the majesty of which has been revered not only by the pious, but also sometimes by the impious, as is narrated in Judges of Eglon, King of the Moabites.