If there be among you any man, that is not clean by reason of uncleanness that chanceth him by night, then shall he go abroad out of the camp, he shall not come within the camp:
Leviticus 15:16
And if any man's seed of copulation go out from him, then he shall wash all his flesh in water, and be unclean until the even.
Numbers 5:2
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 the dead:
Numbers 5:3
Both male and female shall ye put out, without the camp shall ye put them; that they defile not their camps, in the midst whereof I dwell.
1 Corinthians 5:11-13
11
But now I have written unto you not to keep company, if any man that is called a brother be a fornicator, or covetous, or an idolater, or a railer, or a drunkard, or an extortioner; with such an one no not to eat.
12
For what have I to do to judge them also that are without? do not ye judge them that are within?
13
But them that are without God judgeth. Therefore put away from among yourselves that wicked person.