Deuteronomy 23:10

When there is in thy midst a man who is not clean through a mischance of the night, then shall he go forth unto the outside of the camp, he shall not come into the midst of the camp;

Leviticus 15:16

And, when there goeth out from, any man, an outflow of seed, then shall he bathe all his flesh in water, and be unclean until the evening.

Numbers 5:2-3

Command the sons of Israel, that they send forth out of the camp, every leper, and every one that hath a flux, - and every one that is unclean by the dead:

1 Corinthians 5:11-13

But, now, I have written unto you not to be mixing yourselves up, - if anyone named a brother, be a fornicator, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner, with such a one as this, not so much, as to be eating together,

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, when there goeth out from, any man, an outflow of seed, then shall he bathe all his flesh in water, and be unclean until the evening.
Numbers 5:2
Command the sons of Israel, that they send forth out of the camp, every leper, and every one that hath a flux, - and every one that is unclean by the dead:
1 Corinthians 5:11
But, now, I have written unto you not to be mixing yourselves up, - if anyone named a brother, be a fornicator, or covetous, or an idolater, or a reviler, or a drunkard, or an extortioner, with such a one as this, not so much, as to be eating together,