حَدَّثَنَا مُوسَى بْنُ إِسْمَاعِيلَ، حَدَّثَنَا عَبْدُ الْعَزِيزِ بْنُ أَبِي حَازِمٍ، قَالَ حَدَّثَنِي بِمِنًى، عَنْ أَبِيهِ، عَنِ ابْنِ عُمَرَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ الْقَدَرِيَّةُ مَجُوسُ هَذِهِ الأُمَّةِ إِنْ مَرِضُوا فَلاَ تَعُودُوهُمْ وَإِنْ مَاتُوا فَلاَ تَشْهَدُوهُمْ ‏"‏ ‏.‏
Translation
Ibn ‘Abbas said

Ubayy b. Ka’b told me that the Messenger of Allah (May peace be upon him) said : Al-khidr saw a youth playing with boys. He took him by his head and uprooted it. Moses then said : Hast thou slain an innocent person who had slain none.