Deuteronomy 23:10
"If [there] is among you a man that is not clean because of a seminal emission {during the night}, he shall go outside the camp; he shall not come within the camp.
Leviticus 15:16
" 'And if an emission of semen goes out from anyone, then he shall wash all of his body with water, and he shall be unclean until the evening.
Numbers 5:2-3
"Command the {Israelites}: they must send everyone from the camp who is afflicted with a rash, everyone with a fluid discharge, and everyone unclean through [contact with] a corpse.
1 Corinthians 5:11-13
But now I have written to you not to associate with any so-called brother, if he is a sexually immoral person or a greedy person or an idolater or an abusive person or a drunkard or a swindler--with such a person not even to eat.