Deuteronomy 23:10

If there is among you any man who is unclean because of a nocturnal emission he must go outside the camp. He may not reenter the camp.

Leviticus 15:16

If a man has an emission of semen, he must bathe his whole body. He will be unclean until evening.

Numbers 5:2-3

Command the Israelites to send outside the camp anyone who has a serious skin disease or a discharge or anyone who is unclean from touching a dead body.

1 Corinthians 5:11-13

I wrote you not to keep company with any man who is called a brother who is a fornicator, or who is greedy, or who worships idols, or constantly gets drunk, or cheats people. Do not even eat with such a person.

Treasury of Scripture Knowledge

Summary

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:

Bible References

General references

Leviticus 15:16
If a man has an emission of semen, he must bathe his whole body. He will be unclean until evening.
Numbers 5:2
Command the Israelites to send outside the camp anyone who has a serious skin disease or a discharge or anyone who is unclean from touching a dead body.
1 Corinthians 5:11
I wrote you not to keep company with any man who is called a brother who is a fornicator, or who is greedy, or who worships idols, or constantly gets drunk, or cheats people. Do not even eat with such a person.