The Heidelberg Catechism

What is required in the third commandment?

That we, not only by cursing [277] or perjury, [278] but also by rash swearing, [279] must not profane or abuse the name of God; nor by silence or connivance be partakers of these horrible sins in others; [280] and, briefly, that we use the holy name of God no otherwise than with fear and reverence; [281] so that he may be rightly confessed [282] and worshipped by us, [283] and be glorified in all our words and works. [284]