1 Corinthians 5:7-13
Get rid of the old yeast [i.e., of sin, and especially the unrepentant sinner], so that you can be a new batch of dough, without yeast in it [i.e., a godly church without unrepentant sinners in it] as [I know] you really are. For our Passover [Lamb], Christ, has already been sacrificed.
2 Corinthians 6:16-17
And what agreement is there between a temple of God and idols? For we are a temple of the living God, just as God said [Lev. 26:12], "I will live in them and walk among them [i.e., among His people]; and I will be their God and they will be my people."
2 Thessalonians 3:6
Now we command you, brothers, in the name [i.e., by the authority] of our Lord Jesus Christ, that you people stay away from every brother [or sister] who lives an idle life [See note on I Thess. 5:14], and not according to the [inspired] tradition which you received from us.
Titus 3:10
After you have warned a divisive person twice, have nothing more to do with him [i.e., withdraw spiritual fellowship from him].
Hebrews 12:15-16
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],
2 John 1:10-11
If anyone comes to you [i.e., to your meetings] who does not bring this teaching [about Christ], you should not welcome him into your home or give him [any] greetings [i.e., suggesting approval or endorsement].
Revelation 21:3
And I heard a loud voice from the throne saying, "Look, the Tabernacle of God [i.e., God's presence] is with people and He will live with them, and they will be His people, and God Himself will be among them {{Some ancient manuscripts add "and will be their God"}}.
Revelation 21:27
And there will never be anything [morally] unclean allowed to enter it, nor any person who practices disgusting behavior [i.e., probably such sins as sexual perversion], or [any person] who is a liar. But the only ones [allowed there] are those [whose names are] recorded in the Lamb's book of life.