Deuteronomy 23:11 KJV
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.
Deuteronomy 23:11, King James Version
In context
10 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:
11 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.
12 Thou shalt have a place also without the camp, whither thou shalt go forth abroad: