Romans 1:32
who, although knowing the ordinance of God, that they who practise such things deserve death, not only do them themselves, but approve of those who do them.
Romans 12:9
Let your love be unfeigned. Abhor that which is evil, cleave to that which is good.
1 Corinthians 15:33
Be not deceived; "evil communications corrupt good manners."
2 Corinthians 6:14-16
Be not strangely yoked with unbelievers; for what fellowship hath righteousness with unrighteousness? Or what communion hath light with darkness?
Revelation 2:4
But I have this against thee, that thou hast left thy first love.