As-Sajdah - 32:17

فَلَا تَعْلَمُ نَفْسٌ مَّا أُخْفِيَ لَهُم مِّن قُرَّةِ أَعْيُنٍ جَزَاء بِمَا كَانُوا يَعْمَلُونَ
[32:17]
So no soul knows what is hidden for them of that which will refresh the eyes; a reward for what they did.
Now no person knows what delights of the eye are kept hidden (in reserve) for them - as a reward for their (good) deeds.
No soul knoweth what is kept hid for them of joy, as a reward for what they used to do.