إِنَّ الَّذِينَ يَكْفُرُونَ بِآيَاتِ اللَّهِ وَيَقْتُلُونَ النَّبِيِّينَ بِغَيْرِ حَقٍّ وَيَقْتُلُونَ الَّذِينَ يَأْمُرُونَ بِالْقِسْطِ مِنَ النَّاسِ فَبَشِّرْهُم بِعَذَابٍ أَلِيمٍ (21)
(3:21) Give those who refuse to follow the directives of Allah, who slay the Prophets unjustly, and who slay those who enjoin justice, give them glad tidings of a grievous chastisement. *19
*19). This is a sarcastic remark. Its purpose is to bring home to them that the misdeeds about which they are so jubilant, and which they regard as their proud achievements, will ultimately lead them to a painful end.