Deuteronomy 23:10
If there be with thee a man that is not clean from what hath happened in the night, then shall he go outside the camp; he shall not come inside the camp;
Leviticus 15:16
And if any man's seed of copulation pass from him, then he shall bathe his whole flesh in water, and be unclean until the even.
Numbers 5:2-3
Command the children of Israel, that they put out of the camp every leper, and every one that hath an issue, and whosoever is defiled by a dead person:
1 Corinthians 5:11-13
But now I have written to you, if any one called brother be fornicator, or avaricious, or idolater, or abusive, or a drunkard, or rapacious, not to mix with him; with such a one not even to eat.