Sahih Muslim | Book 16 | Hadith Number 4156

Narrated by 'Abdullah (b. Mas'ud)
'Abdullah (b. Mas'ud) reported: Allah's Apostle (may peace be upon him) 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.