Muslim and the compilers of the Sunan—al-Nasāʾī excepted—also relate, on the authority of Abū Dharr, a narration similar to this one (1).
As for the second report, Imām Aḥmad (2) said: “Abū Muʿāwiyah and Wakīʿ told us; both said: al-Aʿmash narrated to us from ʿAbd Allāh ibn Murrah, from Masrūq, from Ibn Masʿūd who said: The Messenger of Allah ﷺ declared, ‘Whenever a person is killed unjustly, a share (3) of the blame for that blood rests upon the first son of Adam, for he was the first to institute killing.’”
All of the major compilers—save Abū Dāwūd (4)—transmit this ḥadīth through the chain of al-Aʿmash. The same statement is also reported from ʿAbd Allāh ibn ʿAmr ibn al-ʿĀṣ and from Ibrāhīm al-Nakhaʿī.
[On Mount Qāsiyūn, north of Damascus, there is a cave known as “the Cave of Blood,” reputed to be the spot where Cain slew his brother Abel. This attribution was taken from the People of the Book, and Allah knows best as to its accuracy. Ḥāfiẓ Ibn ʿAsākir, in his biography of Aḥmad ibn Kathīr—whom he describes as a righteous man—relates that Aḥmad saw the Prophet ﷺ together with Abū Bakr, ʿUmar, and Abel. He asked Abel under oath whether this was indeed his blood, and Abel swore that it was. Aḥmad then asked Allah Most High to make that place one where supplications are answered, and his request was granted; the Messenger of Allah ﷺ confirmed this and said that he, Abū Bakr, and ʿUmar visit the site every Thursday (5). Even if the dream attributed to Aḥmad ibn Kathīr were authentic, no legal ruling could be based upon it, and Allah knows best] (6).
Concerning the Almighty’s words: “So Allah sent a raven scratching in the earth to show him how to conceal his brother’s disgrace. He said, ‘Woe unto me! Am I unable to be like this raven and conceal my brother’s disgrace?’ So he became one of the remorseful” (al-Māʾidah 5:31): some have said that, after killing him, he carried the body on his back for a year. Others say he bore it for a hundred years, and he remained in that state until Allah sent two ravens—al-Suddi (7), citing the Companions, says they were brothers—which fought until one slew the other; when the victorious one had killed his companion he dug a hole in the earth for him,