Deuteronomy 23:10
If there be among you any man, who is not clean by reason of an accident by night, then he shall go abroad out of the camp. He shall not come inside the camp.
Leviticus 15:16
And if any man's seed of copulation go out from him, then he shall bathe 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 every man who has an issue, and whoever is unclean about life.
1 Corinthians 5:11-13
But now I write to you not to associate if any man who is called a brother is a fornicator, or a greedy man, or an idolater, or a slanderer, or a drunkard, or a predator, not even to eat with such kind.