Al-Insan 76:19

Wayatoofu AAalayhim wildanunmukhalladoona itha raaytahum hasibtahum lu/lu-anmanthoora

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

And circling around them will be serving boys, blessed with eternal youth; when you would see them, you would take them as scattered pearls.