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The Prophet (ﷺ) said, "None is killed unjustly, but the first son of Adam will have a part of its burden." Sufyan said, "..a part of its blood because he was the first to establish the tradition of murdering"

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."

Allah's Messenger (ﷺ) having said: No person who is killed unjustly, but the share of (this offence of his also) falls upon the first son of Adam, for he was the first to introduce killing.

This hadith has been narrated on the authority of Jarir and 'Isa b. Yunus with a slight variation of words.

“No person is killed wrongfully, but a share of responsibility for his blood will be upon, the first son of Adam, because he was the first one to kill.”