Deuteronomy 23:10

If there shall be in thee a man that shall not be clean from chance of the night, and he shall go forth without the camp; he shall not come in to the midst of the camp:

Leviticus 15:16

And a man, when the effusion of seed shall go forth from him, and he washed in water all his flesh, and was unclean till the evening

Numbers 5:2-3

Command the sons of Israel, and they shall send forth from the camp every one leprous, and every one flowing, and every one unclean for the soul:

1 Corinthians 5:11-13

And now I wrote to you not to mix together, if any called a brother is a fornicator, or covetous, or an idolater, or a railer, or intoxicated, or rapacious; not to eat with such.

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
And a man, when the effusion of seed shall go forth from him, and he washed in water all his flesh, and was unclean till the evening
Numbers 5:2
Command the sons of Israel, and they shall send forth from the camp every one leprous, and every one flowing, and every one unclean for the soul:
1 Corinthians 5:11
And now I wrote to you not to mix together, if any called a brother is a fornicator, or covetous, or an idolater, or a railer, or intoxicated, or rapacious; not to eat with such.