Verse 9. - But in vain, etc. The Hebrew gives, "And their fear of me is a commandment of men which hath been taught them," or "learned by rote" (Revised Version). Septuagint, "In vain do they worship me, teaching men's commandments and doctrines." Their worship is vitiated at its very root. Commandments of men.
- Thou shalt not take the name of the Lord thy God in vain; literally, Thou shalt not take [or lift] up the Name of Jehovah thy God to vanity. This commandment forbids not only all false swearing by the Name of God, but all profanation of that Name by an irreverent or light use of it (Leviticus 19:12). Deuteronomy 5:11
According to a priest on Catholic.com: The consensus of theologians has been that the second commandment forbids deliberate misuse of the name of God. Such misuse would be false oaths or using the name of God in a hateful or defiant manner. The context of “Oh my God” makes all the difference. It is most often used as an expression of shock
mTOM.