What the Bible says about the First Command-- Worship God Alone

No Other Gods

I am Yahweh your God, who brought you out of the land of Egypt, out of the house of slavery. You shall have no other gods before Me.

Exodus 20:2-3

Yahweh is Alone

Hear, O Israel! Yahweh is our God, Yahweh is alone! You shall love Yahweh your God with all your heart and with all your soul and with all your might.

Deuteronomy 6:4-5

Worshiping God is serious

For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men who suppress the truth in unrighteousness, because that which is known about God is evident within them; for God made it evident to them. For since the creation of the world His invisible attributes, His eternal power and divine nature, have been clearly seen, being understood through what has been made, so that they are without excuse. For even though they knew God, they did not honor Him as God or give thanks, but they became futile in their speculations, and their foolish heart was darkened. Professing to be wise, they became fools, and exchanged the glory of the incorruptible God for an image in the form of corruptible man and of birds and four-footed animals and crawling creatures. Therefore God gave them over in the lusts of their hearts to impurity, so that their bodies would be dishonored among them. For they exchanged the truth of God for a lie, and worshiped and served the creature rather than the Creator, who is blessed forever. Amen.

Romans 1:18-25

Worshiping God alone is loyalty to Him

Then the sons of Israel again did evil in the sight of Yahweh, served the Baals and the Ashtaroth, the gods of Aram, the gods of Sidon, the gods of Moab, the gods of the sons of Ammon, and the gods of the Philistines; thus they forsook the LORD and did not serve Him. The anger of Yahweh burned against Israel, and He sold them into the hands of the Philistines and into the hands of the sons of Ammon. They afflicted and crushed the sons of Israel that year; for eighteen years they afflicted all the sons of Israel who were beyond the Jordan in Gilead in the land of the Amorites.

The sons of Ammon crossed the Jordan to fight also against Judah, Benjamin, and the house of Ephraim, so that Israel was greatly distressed. Then the sons of Israel cried out to Yahweh, saying, "We have sinned against You, for indeed, we have forsaken our God and served the Baals." Yahweh said to the sons of Israel, "Did I not deliver you from the Egyptians, the Amorites, the sons of Ammon, and the Philistines? Also when the Sidonians, the Amalekites and the Maonites oppressed you, you cried out to Me, and I delivered you from their hands. Yet you have forsaken Me and served other gods; therefore I will no longer deliver you. Go and cry out to the gods which you have chosen; let them deliver you in the time of your distress." The sons of Israel said to Yahweh, "We have sinned, do to us whatever seems good to You; only please deliver us this day." So they put away the foreign gods from among them and served Yahweh; and He could bear the misery of Israel no longer.

Judges 10:6-16

No one can serve two Lords

No one can serve two lords; for either he will hate the one and love the other, or he will be devoted to one and despise the other. You cannot serve God and wealth.

Matthew 6:24

Worshiping other gods is worshiping demons

The things which the Gentiles sacrifice, they sacrifice to demons and not to God; and I do not want you to become sharers in demons. You cannot drink the cup of the Lord and the cup of demons; you cannot partake of the table of the Lord and the table of demons. Or do we provoke the Lord to jealousy? We are not stronger than He, are we?

I Corinthians 10:20-22

God is jealous

Do you not know that friendship with the world is hostility toward God? Therefore whoever wishes to be a friend of the world makes himself an enemy of God. Or do you think that the Scripture speaks to no purpose: "He jealously desires the Spirit which He has made to dwell in us"? But He gives a greater grace. Therefore it says, "GOD IS OPPOSED TO THE PROUD, BUT GIVES GRACE TO THE HUMBLE." Submit therefore to God. Resist the devil and he will flee from you.

James 4:4-7