Al-Maaida 5:27

Relate to them the story of the two sons of Adam in truth, when both offered a sacrifice; it was accepted from one [i.e., Abel] but not accepted from the other [i.e., Cain][25]. The latter said, “I will kill you.” The former said, “Allah only accepts from those who fear Him.

[25] The Prophet (ﷺ) said: “No soul ever gets killed unjustifiably, unless the early son of Adam (Cain) gets some of the burden of its blood, for he was the first human to spill blood”. [Al-Bukhārī: 3335, Muslim: 1677]

And recite to them the story of Adam's two sons, in truth, when they both made an offering [to Allāh], and it was accepted from one of them but was not accepted from the other. Said [the latter], "I will surely kill you." Said [the former], "Indeed, Allāh only accepts from the righteous [who fear Him].

27. And (O Muhammad صلى الله عليه وسلم) recite to them (the Jews) the story of the two sons of Adam (Hâbîl and Qâbîl-Abel and Cain) in truth; when each offered a sacrifice (to Allâh), it was accepted from the one but not from the other. The latter said to the former: "I will surely kill you.[9]" The former said: "Verily, Allâh accepts only from those who are Al-Muttaqûn (the pious - See V.2:2)."

[9] (V.5:27) Narrated ‘Abdullâh رضي الله عنه: The Prophetصلى الله عليه وسلم said, "None (no human being) is killed or murdered (unjustly), but a part of responsibility for the crime is laid on the first son of Adam who invented the tradition of killing (murdering) on the earth. (It is said that he was Qâbîl)." (Sahih Al-Bukhâri, Vol.9, Hadîth No.6)
Narrated ‘Abdullâh bin ‘Umar رضي الله عنهما: The Prophet صلى الله عليه وسلم said, "After me (i.e., after my death), do not become disbelievers, by striking (cutting) the necks of one another."
(Sahih Al-Bukhârî, Vol.9, Hadîth No.7).

But recite unto them with truth the tale of the two sons of Adam, how they offered each a sacrifice, and it was accepted from the one of them and it was not accepted from the other. (The one) said: I will surely kill thee. (The other) answered: Allah accepteth only from those who ward off (evil).