Q. 53. What is forbidden in the first commandment?
A. The first commandment forbids the denying, or not worshipping and glorifying the true God, as God and our God; and the giving that worship and glory to any other, which is due unto Him alone.
And Joshua said to all the people, “Behold, this stone shall be a witness against us, for it has heard all the words of the Lord that he spoke to us. Therefore it shall be a witness against you, lest you deal falsely with your God.” Joshua 24:27
For his invisible attributes, namely, his eternal power and divine nature, have been clearly perceived, ever since the creation of the world, in the things that have been made. So they are without excuse. For although they knew God, they did not honor him as God or give thanks to him, but they became futile in their thinking, and their foolish hearts were darkened. Romans 1:20-21
The fool says in his heart, “There is no God.”
They are corrupt, they do abominable deeds,
there is none who does good. Psalms 14:1
because they exchanged the truth about God for a lie and worshiped and served the creature rather than the Creator, who is blessed forever! Amen. Romans 1:25