question #3 Sahih al-Bukhari 967, Book 13, Hadith 16 : What can be learned about the consequences of actions that go against Islamic guidelines from this interaction?

Al-Hajjaj went to Ibn `Umar while I was present there. Al-Hajjaj asked Ibn `Umar, “How are you?”
Ibn `Umar replied, “I am all right,” Al-Hajjaj asked, “Who wounded you?” Ibn `Umar replied, “The
person who allowed arms to be carried on the day on which it was forbidden to carry them (he meant
Al-Hajjaj).”