Tafseer Ibn Kathir of AL INSAAN [19]

وَيَطُوفُ عَلَيْهِمْ وِلْدَانٌ 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.