The soldiers knew that they must be on guard during the battle that they shouldn't see anything indecent among the immoral Midyanites, but they felt that once they returned to their homes they were safe and did not have to be on guard. Elazar therefore warned them that even though the bad was no longer obvious, their minds had absorbed the bad thoughts and feelings from wartime and these impurities still had to be purged. My friends, we know that the battlefield today is the street. The morality level is extremely low. However, we sometimes feel safe at home.
Today there is a new intruder that is affecting our minds and the minds of our children.
It is the indecent music that is being played and heard in the parties of our community. Our young children are coming home with a new form of filth that is polluting their minds. Let's be on guard, raise our voice in protest to ban this intruder from our homes. This section of the Torah deals with the koshering of vessels that were previously used for unkosher food. It was imperative to remove any unkosher food that was absorbed in the vessel before using it for kosher food.