Deuteronomy 23:10 in the King James Version
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:
Context
9 When you go out and camp against your enemies, then you shall keep yourselves from every evil thing.
10 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;
11 but it shall be, when evening comes, he shall bathe himself in water. When the sun is down, he shall come within the camp.