فَانطَلَقَا حَتَّى إِذَا لَقِيَا غُلَامًا فَقَتَلَهُ قَالَ أَقَتَلْتَ نَفْسًا زَكِيَّةً بِغَيْرِ نَفْسٍ لَّقَدْ جِئْتَ شَيْئًا نُّكْرًا
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سورة الكهف
(18/74) Then the twain journeyed until when they met a boy, and he killed him. Musa said: hast thou slain a person innocent not in return for a Person Assuredly thou hast committed a thing formidable.
Surah Al-Kahf