Deuteronomy 23:8-12

The children that are begotten of them shall enter into the congregation of the LORD in their third generation.

When the host goeth forth against thine enemies, then 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:

But it shall be, when evening cometh on, he shall wash himself with water: and when the sun is down, he shall come into the camp again.

Thou shalt have a place also without the camp, whither thou shalt go forth abroad: