Chapter: The sin of the one who set the precedent of killing

Allah's Apostle (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.