السجدة · Verse 17 / 30 · Page 416
فَلَا تَعْلَمُ نَفْسٌ مَّا أُخْفِيَ لَهُم مِّن قُرَّةِ أَعْيُنٍ جَزَاءً بِمَا كَانُوا يَعْمَلُونَ
Falaa ta'lamu nafsum maaa ukhfiya lahum min qurrati a'yunin jazaaa'am bimaa kaanoo ya'maloon
And no soul knows what has been hidden for them of comfort for eyes as reward for what they used to do.
So no one knows what things Allah has prepared for it in terms of bringing coolness and joy to the eyes, as a reward for the good deeds it would do in the world. It is a reward that no one except Allah can comprehend, due to its greatness.
Source: Al-Mukhtasar Tafsir — Tafsir Center for Quranic Studies.
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