Deuteronomy 23:12 in the King James Version
Thou shalt have a place also without the camp, whither thou shalt go forth abroad:
Context
11 but it shall be, when evening comes, he shall bathe himself in water. When the sun is down, he shall come within the camp.
12 You shall have a place also outside of the camp where you go relieve yourself.
13 You shall have a trowel among your weapons. It shall be, when you relieve yourself, you shall dig with it, and shall turn back and cover your excrement;