Adulterers and adulteresses! Do you not know that friendship with the world is enmity with God? Whoever therefore wants to be a friend of the world makes himself an enemy of God.
John 15: 19
If you were of the world, the world would love its own. Yet because you are not of the world, but I chose you out of the world, therefore the world hates you.
2 Tim 2: 4
No one engaged in warfare entangles himself with the affairs of this life, that he may please him who enlisted him as a soldier.
1 John 2: 15 - 17
Do not love the world or the things in the world. If anyone loves the world, the love of the Father is not in him. 16 For all that is in the world - the lust of the flesh, the lust of the eyes, and the pride of life - is not of the Father but is of the world. 17 And the world is passing away, and the lust of it; but he who does the will of God abides forever.
2 Cor 6: 14 - 17
Do not be unequally yoked together with unbelievers. For what fellowship has righteousness with lawlessness? And what communion has light with darkness? 15 And what accord has Christ with Belial? Or what part has a believer with an unbeliever? 16 And what agreement has the temple of God with idols? For you are the temple of the living God. As God has said: 'I will dwell in them and walk among them. I will be their God, and they shall be My people.' 17 Therefore 'Come out from among them and be separate, says the Lord. Do not touch what is unclean, and I will receive you.'
Eph 5: 11
And have no fellowship with the unfruitful works of darkness, but rather expose them.
Romans 12: 2
And do not be conformed to this world, but be transformed by the renewing of your mind, that you may prove what is that good and acceptable and perfect will of God.