Hirabah is a big word that means stealing and hurting people. It's like when a big bully takes something from a smaller kid, and then also punches them in the face. It's not nice or fair at all.
In some religions, like Islam, hirabah is a very serious crime. It's even worse than just stealing something, because it includes hurting people too. So if someone does hirabah, they can get in really big trouble with the law.
Basically, hirabah is a no-no. Don't take things that aren't yours, and definitely don't hurt people while doing it. It's always better to be kind and respectful of others!