The Westminster Larger Catechism

Q.106. What do the words, before me, in the first commandment specifically teach?

A. The words, before me, or “before my face,” in the first commandment teach us that God, who sees everything, takes special note of and is very offended by the sin of having any other god. These words emphasize then how important it is to obey this commandment and how disobeying it insolently provokes God;[1] they also urge us to be just as mindful of the fact that God sees everything we do as we are of doing things in his service.[2]

1 Ezekiel 8:5-18 dummy text
Psalms 44:20-21 dummy text
2 1 Chronicles 28:9 dummy text