Deuteronomy 23:9

When the host goeth forth against thine enemies, then keep thee from every wicked thing.

When the host goeth forth against thine enemies, then keep thee from every wicked thing - from theft, violence, licentiousness, and all the excesses incident to life in a camp (Luke 3:14). Cleanliness being indispensably necessary, the strictest sanitary regulations are always enforced by those who have charge of a large body of men-the first appearance of disease is watched, and precautions are taken to prevent the spread of infection. But in warm climates something more is required, and constant care must be taken in the removal of foul, putrescent, or fetid matter.