Matthew 6:24
No one can serve two masters: for he will either hate the one and love the other; or he will hold to the one, and neglect the other. You can not serve God and riches.
Luke 16:13
No servant can serve two masters; for he will either hate the one, and love the other; or he will cleave to the one, and despise the other. You can not serve God and riches.
2 Thessalonians 2:11-12
And for this reason God will send them strong delusion, in order that they may believe a lie,
James 1:8
A double-minded man is unstable in all his ways.
James 4:4
Adulterers and adulteresses, know you not that the friend ship of the world is enmity to God? Whoever, therefore, will be a friend of the world, is an enemy of God.
1 John 2:15
Love not the world, nor the things that are in the world. If any man loves the world, the love of the Father is not in him.
Revelation 3:15-16
I know your works, that you are neither cold, nor hot: I wish that you were cold, or hot.