Deuteronomy 23:10
If someone among you becomes unclean due to nocturnal emissions, he must leave the camp and stay outside.
Leviticus 15:16
"If a man has a seminal emission, he is to bathe his entire body with water and remain unclean until evening.
Numbers 5:2-3
"Command the Israelis to send outside the encampment every leper, everyone who has a discharge, and whoever is ritually defiled by contact with a corpse.
1 Corinthians 5:11-13
But now I am writing to you to stop associating with any so-called brother if he is sexually immoral, greedy, an idolater, a slanderer, a drunk, or a robber. You must even stop eating with someone like that.