Deuteronomy 23:13-14

13And thou shalt have a shovel amongst thy weapons, and it shall be, when thou sittest down abroad, thou shalt dig therewith, and shalt turn back and cover that which is come from thee.

14For Jehovah thy 1God walketh in the midst of thy camp, to deliver thee, and to give up thine enemies before thee; and thy camp shall be holy, that he see nothing unseemly with thee, and turn away from thee.