Deuteronomy 23:10-15

10If there shall be among you any man, that is not clean by reason of uncleanness that chanceth to 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 .1 12Thou shalt have a place also outside the camp, where thou shalt go forth abroad: 13And thou shalt have a shovel among thy weapons; and it shall be, when thou wilt ease thyself abroad, thou shalt dig with it, and shalt turn back and cover that which cometh from thee:2 14For the LORD thy God walketh in the midst of thy camp, to deliver thee, and to give up thy enemies before thee; therefore shall thy camp be holy: that he may see no unclean thing in thee, and turn away from thee.3

15Thou shalt not deliver to his master the servant who hath escaped from his master to thee: