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.
Reference: Sahih Muslim 1677 a In-book : Book 28, Hadith 38 USC-MSA web (English) : Book 16, Hadith 4156 (deprecated)
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