Riyad as-Salihin 172
Ibn Mas'ud (May Allah be pleased with him) reported:
The Prophet (ﷺ) said, "The first son of Adam* takes a share of the guilt of every one who murders another wrongfully because he was the initiator of committing murder". [Al-Bukhari and Muslim] . * The son of Adam in the Hadith is said to be Qabil. Allah tells us about his story in Surat Al-Ma'idah (The Table spread with Food). Verses 27-31.
وعن ابن مسعود رضي الله عنه أن النبي  صلى الله عليه وسلم قال‏:‏ ‏
"‏ليس من نفس تقتل ظلماً إلا كان على ابن آدم الأول كفل من دمها لأنه كان أول من سن القتل‏"‏ ‏(‏‏(‏متفق عليه‏)‏‏)‏ ‏.‏