Deuteronomy 23:14

for the Lord, thy God, walketh in the midst of thy camp to deliver thee and to give up thine enemies before thee; therefore shall thy camp be holy; that he see no unclean thing in thee and turn away from thee, not as though the easement in itself and the excrement were shameful, but its open presence could not be tolerated without destroying or injuring the reverence for Jehovah. Propriety and decency also in the matters here broached should be observed as a requirement of nature.