Korach decides to pick a fight with Moses. He says: Hey! I'm a Levite, too! Don't I deserve to be given as much honor as you Moses? A whole group of Israelites decides to take Korach's side. And, boy, are they sorry. The earth opens beneath them and swallows them all.
Have you ever decided to take sides when two of your friends are having a fight? How did that turn out for you? If you ever see a fight going on, it's better to get involved only as a peacemaker and not as a side-taker.