1 Corinthians 15:33
Do not be fooled; bad company ruins good moral behavior.
2 Timothy 2:17-18
and their talk will spread like gangrene. Among these people are Hymenaeus and Philetus,
Hebrews 12:15
Look carefully [at how you are living] so that no one falls away from God's unearned favor, and that no "poisonous plant sprouts up" to cause trouble and corrupt many people [Note: This is an analogy from Deut. 29:16-18 being used as a warning against the evil influence of wicked people],
Revelation 18:4
Then I heard another voice from heaven, saying, "Come out of her, my people, so that you do not share in her sins, and so that you do not receive her plagues [i.e., judgments].