1 Kings 18:21

1 Corinthians 10:21-22 NIV
You cannot drink the cup of the Lord and the cup of demons too; you cannot have a part in both the Lord’s table and the table of demons. Are we trying to arouse the Lord’s jealousy? Are we stronger than he?

2 Corinthians 6:14-16 NIV
Do not be yoked together with unbelievers. For what do righteousness and wickedness have in common? Or what fellowship can light have with darkness? What harmony is there between Christ and Belial ? Or what does a believer have in common with an unbeliever? What agreement is there between the temple of God and idols? For we are the temple of the living God. As God has said: “I will live with them and walk among them, and I will be their God, and they will be my people.”

2 Kings 17:41 NIV
Even while these people were worshiping the Lord, they were serving their idols. To this day their children and grandchildren continue to do as their ancestors did.

Joshua 24:15 NIV
But if serving the Lord seems undesirable to you, then choose for yourselves this day whom you will serve, whether the gods your ancestors served beyond the Euphrates, or the gods of the Amorites, in whose land you are living. But as for me and my household, we will serve the Lord.”

Matthew 6:24 NIV
“No one can serve two masters. Either you will hate the one and love the other, or you will be devoted to the one and despise the other. You cannot serve both God and money.