Q47: What is forbidden in the first commandment?
A: The first commandment forbiddeth the denying1, or not worshipping and glorifying the true God as God2, and our God3; and the giving of that worship and glory to any other, which is due to him alone4.
1. The fool hath said in his heart, there is no God. (Psalms 14:1).
2. So that they are without excuse: Because that, when they knew God, they glorified [him] not as God. (Romans 1:20b-21a).
3. But my people would not hearken to my voice; and Israel would none of me. (Psalms 81:11).
4. Who changed the truth of God into a lie, and worshipped and served the creature more than the Creator, who is blessed for ever. Amen. (Romans 1:25).