Undressing

HH
In the book of Nehemiah we are told that when they rebuilt the walls of Jerusalem they did not change their clothing at night. Rabbi Moshe Dovid Valli explains that the clothing are ohr makifim encompassing sheilds and therefore at times of danger, like at war, one should not forgo their protection even momentarily to change into other clothing. He proceeds to ask if that is the case, why do we ever change it night into pajamas and leave ourselves vulnerable? He answers that it is similar to the concept of mayim achronim (water at the end of the meal to clean the hands) which gives residual sustenance to the realm of evil thereby pacifying it with a tiny tribute.

Na Nach Nachma Nachman Meuman