Sahih Bukhari
Sahih Bukhari Volume 004, Book 055, Hadith Number 552.
Hadith Section/Book: Sahih Bukhari Sahih Bukhari Book 55. Prophets
Narated By Abdullah : Allah's Apostle 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."