Leviticus 14:36
"The priest is to command that the house be cleared before he comes to examine the contagion so that not everything in the house becomes unclean. After this, the priest is to enter the house and examine it.
1 Corinthians 15:33
Stop being deceived: "Wicked friends lead to evil ends."
2 Timothy 2:17-18
and what they say will spread everywhere like gangrene. Hymenaeus and Philetus are like that.
Hebrews 12:15
See to it that no one fails to obtain the grace of God and that no bitter root grows up and causes you trouble, or many of you will become defiled.
Revelation 18:4
Then I heard another voice from heaven saying, "Come out of her, my people, so that you don't participate in her sins and also suffer from her diseases.