Surah Al-Kahf Verse 74 - English Translation by Safi Ur Rahman Al Mubarakpuri
Surah Al-Kahfفَٱنطَلَقَا حَتَّىٰٓ إِذَا لَقِيَا غُلَٰمٗا فَقَتَلَهُۥ قَالَ أَقَتَلۡتَ نَفۡسٗا زَكِيَّةَۢ بِغَيۡرِ نَفۡسٖ لَّقَدۡ جِئۡتَ شَيۡـٔٗا نُّكۡرٗا
Then they both proceeded till they met a boy, and he (Khidr) killed him. Musa said: "Have you killed an innocent person without Nafs Verily, you have committed a thing Nukr