فَانْطَلَقَا حَتّٰۤى اِذَا لَقِيَا غُلٰمًا فَقَتَلَهٗۙ قَالَ اَقَتَلۡتَ نَفۡسًا زَكِيَّةًۢ بِغَيۡرِ نَفۡسٍ ؕلَّـقَدۡ جِئۡتَ شَيْئًا نُّكۡرًا
Then both of them proceeded till they met a boy. (Khidr) killed him. Musa (Moses) said: ‘Have you killed an innocent soul without any (retribution due) for anyone killed? Indeed you have done a horrible thing.’