﴿ وَعِندَهُمْ قَٰصِرَٰتُ ٱلطَّرْفِ عِينٌۭ ﴾

“And with them will be mates of modest gaze, most beautiful of eye,”

and with them will be maidens of restrained glances who reserved their glances exclusively for their spouses and do not look upon any other — because of the beauty they the maidens see in them — with beautiful eyes ‘īn means with large and beautiful eyes