Roman Catholic Catechism

Deu 5:11  Thou shalt not take the name of the LORD thy God in vain: for the LORD will not hold him guiltless that taketh his name in vain. 

Exo 20:7  Thou shalt not take the name of the LORD thy God in vain; for the LORD will not hold him guiltless that taketh his name in vain. 

Link to the Roman Catholic Catechism

Truth mixed with lies.

From the catechism:

Article 2

THE SECOND COMMANDMENT

You shall not take the name of the Lord your God in vain.72

You have heard that it was said to the men of old, “You shall not swear falsely. . But I say to you, Do not swear at all.73

https://www.vatican.va/archive/ENG0015/__P7H.HTM

2146 The second commandment forbids the abuse of God’s name, i.e., every improper use of the names of God, Jesus Christ, but also of the Virgin Mary and all the saints.

https://www.vatican.va/archive/ENG0015/__P7I.HTM