Romans 1:32
who, though they know the righteous judgment of God, that they who live in such practices are worthy of death, not only do the same, but also find pleasure in the company of those who live in these practices.
Romans 12:9
Let love be undissembled. Abhor that which is evil; cleave to that which is good.
1 Corinthians 15:33
Be not deceived: evil conversations corrupt good manners.
2 Corinthians 6:14-16
Be not unequally yoked with infidels; for what participation hath righteousness with unrighteousness? and what fellowship [is there] between light and darkness?
Revelation 2:4
Yet have I a charge against thee, that thou art gone back from thy first love.