The Statement of Allah the Exalted: "No person knows what is kept hidden for them of joy..." (V.32:17)
حَدَّثَنِي إِسْحَاقُ بْنُ نَصْرٍ، حَدَّثَنَا أَبُو أُسَامَةَ، عَنِ الأَعْمَشِ، حَدَّثَنَا أَبُو صَالِحٍ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ عَنِ النَّبِيِّ صلى الله عليه وسلم " يَقُولُ اللَّهُ تَعَالَى أَعْدَدْتُ لِعِبَادِي الصَّالِحِينَ مَا لاَ عَيْنٌ رَأَتْ، وَلاَ أُذُنٌ سَمِعَتْ، وَلاَ خَطَرَ عَلَى قَلْبِ بَشَرٍ، ذُخْرًا، بَلْهَ مَا أُطْلِعْتُمْ عَلَيْهِ ". ثُمَّ قَرَأَ {فَلاَ تَعْلَمُ نَفْسٌ مَا أُخْفِيَ لَهُمْ مِنْ قُرَّةِ أَعْيُنٍ جَزَاءً بِمَا كَانُوا يَعْمَلُونَ}
Narrated Abu Huraira: The Prophet, said, "Allah said, 'I have prepared for My pious worshipers such things as no eye has ever seen, no ear has ever heard of, and nobody has ever thought of. All that is reserved, besides which, all that you have seen, is nothing." Then he recited:-- 'No soul knows what is kept hidden (in reserve) for them of joy as a reward for what they used to do.' (32.17)