Deuteronomy 23:10

And if thou shouldest go forth to engage with thine enemies, then thou shalt keep thee from every wicked thing.

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:

If there is among you any man who is not clean by reason of that which happens to him by night, then shall he go outside of the camp. He shall not come within the camp;