۞ وَاتْلُ عَلَيْهِمْ نَبَأَ ابْنَيْ آدَمَ بِالْحَقِّ إِذْ قَرَّبَا قُرْبَانًا فَتُقُبِّلَ مِنْ أَحَدِهِمَا وَلَمْ يُتَقَبَّلْ مِنَ الْآخَرِ قَالَ لَأَقْتُلَنَّكَ ۖ قَالَ إِنَّمَا يَتَقَبَّلُ اللَّهُ مِنَ الْمُتَّقِينَ (27)
(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.