Surah Al-Insan 76:19

۞ وَيَطُوفُ عَلَيْهِمْ وِلْدَٰنٌ مُّخَلَّدُونَ إِذَا رَأَيْتَهُمْ حَسِبْتَهُمْ لُؤْلُؤًا مَّنثُورًا

There will circulate among them young boys made eternal. When you see them, you would think them [as beautiful as] scattered pearls.

Translation: Saheeh International

Tafsir

And they will be waited upon by immortal youths immortally in the form of youths never ageing whom when you see them you will suppose them because of their beauty and the way in which they are scattered about offering service to be scattered pearls strewn from their string or from their shells in which they are fairer …

Excerpt from Tafsir al-Jalalayn, commentary on 76:19, via Quran.com. The reader has the full commentary and 9 more tafsirs.