تفسير Tafsir al-Jalalayn
{ فَٱنْطَلَقَا حَتَّىٰ إِذَا لَقِيَا غُلاَماً فَقَتَلَهُ قَالَ أَقَتَلْتَ نَفْساً زَكِيَّةً بِغَيْرِ نَفْسٍ لَّقَدْ جِئْتَ شَيْئاً نُّكْراً } Qur’an 18 :74
So they set off, after leaving the ship, making their way on foot, until, when they met a boy, who had not yet reached puberty, playing with [other] boys, among whom his face was the fairest — and he, al-Khidr, slew him, by slitting his throat with a knife while he lay down, or by tearing his head off with his hand, or by smashing his head against a wall, all of which are [different] opinions (the coordinating fā’ [of fa-qatalahu, ‘and he slew him’] is used here because [it indicates that] the slaying took place after the encounter; the response to idhā, ‘when’ is [the following statement, qāla …]) — he, Moses, said, to him: ‘Have you slain an innocent soul, that is, a pure one that had not reached the age of [legal] responsibility (a variant reading [for zākiya] has zakiyya), [one slain] not in retaliation for another soul?, in other words, one that has not slain any soul. Verily you have committed an dreadful thing’ (read nukran or nukuran), that is to say, an abomination.
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Qur’an 18:80
تفسير Tafsir al-Jalalayn
{ وَأَمَّا ٱلْغُلاَمُ فَكَانَ أَبَوَاهُ مُؤْمِنَيْنِ فَخَشِينَآ أَن يُرْهِقَهُمَا طُغْيَاناً وَكُفْراً }
And as for the boy, his parents were believers and We feared lest he should overwhelm them with insolence and disbelief — for he is as [described] by the hadīth of Muslim, ‘He was [incorrigibly] disposed to disbelief, and had he lived [longer] this [disposition of his] would have oppressed them, because of their love for him, they would have followed him in such [a path of disbelief]’.