Worship of God is commanded of Him, and worship of Him only is also. Being the creator of all things He is a jealous God and will not allow in other thing or person to be worshipped. There's not enough study of His word with the proper teaching is the reason there's so much idolatry in the land today, it's as if they don't realize covetousness is idolatry that leads to we become what we worship being mammon and you cannot serve it and God.