Deuteronomy 23:10
If there is among you any man who is not clean because of an accident at night, then he shall go outside the camp. He shall not come inside the camp.
Leviticus 15:16
And if any man's semen goes from him, then he shall wash all his flesh in water and be unclean until the evening.
Numbers 5:2-3
Command the sons of Israel that they put out of the camp every leper and everyone that has an issue, and whoever is defiled by a dead body.
1 Corinthians 5:11-13
But now I have written to you not to associate intimately, if any man called a brother and is either a fornicator, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner; with such a one not to eat.