Surah Al-Kahf Verse 74 - English Translation by A. J. Arberry
Surah Al-Kahfفَٱنطَلَقَا حَتَّىٰٓ إِذَا لَقِيَا غُلَٰمٗا فَقَتَلَهُۥ قَالَ أَقَتَلۡتَ نَفۡسٗا زَكِيَّةَۢ بِغَيۡرِ نَفۡسٖ لَّقَدۡ جِئۡتَ شَيۡـٔٗا نُّكۡرٗا
So they departed; until, when they met a lad, he slew him. He said, 'What, hast thou slain a soul innocent, and that not to retaliate for a soul slain? Thou hast indeed done a horrible thing