question #1 Sahih al-Bukhari 3335, Book 60, Hadith 10 : What is the significance of the first son of Adam in the context of unjust murder?

Allah’s Messenger (ﷺ) said, “Whenever a person is murdered unjustly, there is a share from the burden of the
crime on the first son of Adam for he was the first to start the tradition of murdering.”