Hadithcore
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". <b>[Al-Bukhari and Muslim]</b>. * 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)‏‏)‏ ‏.‏

References1 variant
In-Book Reference
Introduction, Hadith 172
Sharh · explanationclick to expand
<b>Guidance from the Hadith:</b><br> 1) Whoever introduces an evil practice will bear its sin and the sins of all those who will practice it till the Day of Resurrection.<br> 2) One of the aspects of punishment for a sin is that it drags its doer into committing more sins, unless he repents.<br> 3) Killing without a just cause is one of the major sins with which Allah Almighty has been disobeyed.<br> <br> <br> <br> <b>Words in the Hadith:</b><br> The first son of Adam is Qābil (Cain), as he killed his brother Hābil (Abel).
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