John Wesley on Deuteronomy 23:9

Keep from every wicked thing - Then especially take heed, because that is a time of confusion and licentiousness; when the laws of God and man cannot be heard for the noise of arms; because the success of thy arms depends upon God's blessing, which wicked men have no reason to expect; and because thou dost carry thy life in thy hand, and therefore hast need to be well prepared for death and judgment.