11 But as evening approaches he is to wash himself, and at sunset he may return to the camp.

Read Deuteronomy 23:11 Using Other Translations

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.
but when evening comes, he shall bathe himself in water, and as the sun sets, he may come inside the camp.
Toward evening he must bathe himself, and at sunset he may return to the camp.