Translation of the verse 27 from Surah Al-Ma’idah : Number of verses 120 - - page 112 - Part 6.
And (O Muhammad SAW) recite to them (the Jews) the story of the two sons of Adam [Habil (Abel) and Qabil (Cain)] in truth; when each offered a sacrifice (to Allah), it was accepted from the one but not from the other. The latter said to the former: "I will surely kill you." The former said: "Verily, Allah accepts only from those who are Al-Muttaqun (the pious - see V. 2:2)."
And recite to them the story of Adam's two sons, in truth, when they both offered a sacrifice [to Allah], 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, Allah only accepts from the righteous [who fear Him].
(5:27) Narrate to them in all truth the story of the two sons of Adam. When they made an offering and it was accepted from one of them and was not accepted from the other, the latter said: 'I will surely kill you.' Thereupon the former said: 'Allah accepts offerings only from the God-fearing. *48
*48). God's refusal to accept the sacrifice of one of the two brothers was not due to any wrong the other brother might have committed but to his own lack of piety. Hence, rather than attempt to kill his brother he should be concerned with cultivating piety.