مُّخَلَّدُون
Appears 2 times in the Quran.
(Root: خلد)
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Round about them shall go youths never altering in age,
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76:19 وَيَطُوفُ عَلَيْهِمْ وِلْدَٰنٌ مُّخَلَّدُونَ إِذَا رَأَيْتَهُمْ حَسِبْتَهُمْ لُؤْلُؤًا مَّنثُورًا
And round about them shall go youths never altering in age; when you see them you will think them to be scattered pearls.