Deuteronomy 23:11 KJV

9When the host goeth forth against thine enemies, then keep thee from every wicked thing.

10If 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:

11But 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.

12Thou shalt have a place also without the camp, whither thou shalt go forth abroad:

13And thou shalt have a paddle upon thy weapon; and it shall be, when thou wilt ease thyself abroad, thou shalt dig therewith, and shalt turn back and cover that which cometh from thee: