Deuteronomy 23:13-14

13Always carry a small spade with your other tools. When you go to the toilet, dig a hole with your spade. Then bury your dung in it and cover it with earth.

14For the Lord your God moves among you in your camp. He keeps you safe from your enemies so that you win against them. So make sure that your camp is a holy place. The Lord must not see anything that would bring shame on you. Do not make him turn away from you.