Deuteronomy 23:10
"If any man among you becomes unclean because of a nocturnal emission, then he shall go outside the camp. He shall not come inside the camp,
Leviticus 15:16
"If a man has an emission of semen, he shall bathe his whole body in water and be unclean until the evening.
Numbers 5:2-3
"Command the people of Israel that they put out of the camp everyone who is leprous or has a discharge and everyone who is unclean through contact with the dead.
1 Corinthians 5:11-13
But now I am writing to you not to associate with anyone who bears the name of brother if he is guilty of sexual immorality or greed, or is an idolater, reviler, drunkard, or swindler--not even to eat with such a one.