Jami` at-Tirmidhi 2673
جامع الترمذي#2673SahihNarrated 'Abdullah bin Mas'ud:that the Messenger of Allah (ﷺ) said: "No soul is wrongfully taken except that some of the burden of its blood is upon the son of Adam, because he was the first to institute murder
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Ahmad Muhammad ShakirSahih
Al-AlbaniSahih
Bashar Awad MaaroufHasan Sahih
Zubair Ali ZaiSahih - Agreed Upon
In-book reference: 41:29