Sahih Muslim Book - 1, Hadith - 449

حَدَّثَنَا عُبَيْدُ اللَّهِ بْنُ مَيْسَرَةَ قَالَ حَدَّثَنِي عَبْدُ الرَّحْمَنِ بْنُ مَهْدِيٍّ حَدَّثَنَا حَمَّادُ بْنُ سَلَمَةَ عَنْ ثَابِتٍ الْبُنَانِيِّ عَنْ عَبْدِ الرَّحْمَنِ بْنِ أَبِي لَيْلَى عَنْ صُهَيْبٍ عَنْ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ إِذَا دَخَلَ أَهْلُ الْجَنَّةِ الْجَنَّةَ قَالَ يَقُولُ اللَّهُ تَبَارَكَ وَتَعَالَى تُرِيدُونَ شَيْئًا أَزِيدُكُمْ؟ فَيَقُولُونَ أَلَمْ تُبَيِّضْ وُجُوهَنَا أَلَمْ تُدْخِلْنَا الْجَنَّةَ وَتُنَجِّنَا مِنْ النَّارِ قَالَ فَيَكْشِفُ الْحِجَابَ فَمَا أُعْطُوا شَيْئًا أَحَبَّ إِلَيْهِمْ مِنْ النَّظَرِ إِلَى رَبِّهِمْ عَزَّ وَجَلَّ.

It was narrated from Suhaib that the Prophet (s.a.w) said: "When the people of Paradise have entered Paradise, Allah, Blessed is He and Most High, will say: 'Do you want anything more?' They will say: 'Have You not brightened our faces, and admitted us to Paradise, and saved us from the Fire?' Then He will remove the Veil, and they will not be given anything that is more dear to them than gazing upon their Lord [the Mighty and Sublime]."