Nehemiah 4:21-23

So we continued to work with half the men holding spears from sunrise till the stars came out. At that time I also said to the people, “Let every man and his helper stay inside Jerusalem at night. They can be our guards at night and workmen during the day.” Neither I, my brothers, my workers, nor the guards with me ever took off our clothes. Each person carried his weapon even when he went for water.