Messenger of Allah ﷺ said, "Allah said, "I have prepared for My Pious slaves things which have never been seen by an eye, or heard by an ear, or imagined by a human being." If you wish, you can recite this Verse from the Holy Qur'an:--"No soul knows what is kept hidden for them, of joy as a reward for what they used to do." (32.17) (Using translation from Bukhārī 3244)
عَنِ النَّبِيِّ ﷺ قَالَ اللهُ تَعَالَى أَعْدَدْتُ لِعِبَادِي الصَّالِحِينَ مَا لَا عَيْنٌ رَأَتْ وَلَا أُذُنٌ سَمِعَتْ وَلَا خَطَرَ عَلَى قَلْبِ بَشَرٍ وَاقْرَءُوا إِنْ شِئْتُمْ {فَلَا تَعْلَمُ نَفْسٌ مَا أُخْفِيَ لَهُمْ مِنْ قُرَّةِ أَعْيُنٍ} [السجدة 17]