Sahih al-Bukhari 6863
صحيح البخاري#6863SahihNarrated `Abdullah bin `Umar:One of the evil deeds with bad consequence from which there is no escape for the one who is involved in it is to kill someone unlawfully
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Every narration in Sahih al-Bukhari is accepted as Sahih (authentic) by the established status of the book.
In-book reference: 87:3