Q. 51: What is required in the first commandment?
A. The first commandment requires us to know and acknowledge God to be the only true God and our God; and to worship and glorify Him accordingly.
As for you, my son Solomon, know the God of your father, and serve Him with a loyal heart and with a willing mind; for the LORD searches all hearts and understands all the intent of the thoughts. If you seek Him, He will be found by you; but if you forsake Him, He will cast you off forever. 1 Chronicles 28:9