Hi
Breaking of the the First Commandment is a grievous Mortal sin it should be said in number and in kind,detailed if possible,specifying what they worship would be good.
Then God spoke all these words:
Exodus 20:2 I am the Lord your God, who brought you out of the land of Egypt, out of the house of slavery; 3 you shall have no other gods before me.4 You shall not make for yourself an idol, whether in the form of anything that is in heaven above, or that is on the earth beneath, or that is in the water under the earth. 5 You shall not bow down to them or worship them; for I the Lord your God am a jealous God, punishing children for the iniquity of parents, to the third and the fourth generation of those who reject me, 6 but showing steadfast love to the thousandth generation of those who love me and keep my commandments.
Deuteronomy 4:4 You shall not make for yourself an idol, whether in the form of anything that is in heaven above, or that is on the earth beneath, or that is in the water under the earth. 5 You shall not bow down to them or worship them; for I the Lord your God am a jealous God, punishing children for the iniquity of parents, to the third and the fourth generation of those who reject me, 6 but showing steadfast love to the thousandth generation of those who love me and keep my commandments.
4 So now, Israel, give heed to the statutes and ordinances that I am teaching you to observe, so that you may live to enter and occupy the land that the Lord, the God of your ancestors, is giving you. 2 You must neither add anything to what I command you nor take away anything from it, but keep the commandments of the Lord your God with which I am charging you. 3 You have seen for yourselves what the Lord did with regard to the Baal of Peor—how the Lord your God destroyed from among you everyone who followed the Baal of Peor, 4 while those of you who held fast to the Lord your God are all alive today.