كتاب الجنة وصفة نعيمها وأهلها
53  
The Book of Paradise, its Description, its Bounties and its Inhabitants
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Chapter: The Inhabitants Of Paradise Will See The People In The Highest Place In Paradise As Planets Are Seen In The Sky
(3)
باب تَرَائِي أَهْلِ الْجَنَّةِ أَهْلَ الْغُرَفِ كَمَا يُرَى الْكَوْكَبُ فِي السَّمَاءِ ‏‏
Sahih Muslim 2831 b

Abu Sa'id al-Khudri reported Allah's Messenger (ﷺ) as saying:

The inmates of Paradise would see the inmates of the apartment over them just as you see the shining planets which remain in the eastern and the western horizon because of the superiority some have over others. They said: Allah's Messenger, would in these abodes of Apostles others besides them not be able to reach? He said: Yes, they will, by Him, in Whose hand is my life, those who believe in God and acknowledge the Truth, will reach them.
حَدَّثَنِي عَبْدُ اللَّهِ بْنُ جَعْفَرِ بْنِ يَحْيَى بْنِ خَالِدٍ، حَدَّثَنَا مَعْنٌ، حَدَّثَنَا مَالِكٌ، ح وَحَدَّثَنِي هَارُونُ بْنُ سَعِيدٍ الأَيْلِيُّ، - وَاللَّفْظُ لَهُ - حَدَّثَنَا عَبْدُ اللَّهِ بْنُ وَهْبٍ، أَخْبَرَنِي مَالِكُ بْنُ أَنَسٍ، عَنْ صَفْوَانَ بْنِ سُلَيْمٍ، عَنْ عَطَاءِ بْنِ يَسَارٍ، عَنْ أَبِي سَعِيدٍ الْخُدْرِيِّ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ إِنَّ أَهْلَ الْجَنَّةِ لَيَتَرَاءَوْنَ أَهْلَ الْغُرَفِ مِنْ فَوْقِهِمْ كَمَا تَتَرَاءَوْنَ الْكَوْكَبَ الدُّرِّيَّ الْغَابِرَ مِنَ الأُفُقِ مِنَ الْمَشْرِقِ أَوِ الْمَغْرِبِ لِتَفَاضُلِ مَا بَيْنَهُمْ ‏"‏ ‏.‏ قَالُوا يَا رَسُولَ اللَّهِ تِلْكَ مَنَازِلُ الأَنْبِيَاءِ لاَ يَبْلُغُهَا غَيْرُهُمْ ‏.‏ قَالَ ‏"‏ بَلَى وَالَّذِي نَفْسِي بِيَدِهِ رِجَالٌ آمَنُوا بِاللَّهِ وَصَدَّقُوا الْمُرْسَلِينَ ‏"‏ ‏.‏
Reference : Sahih Muslim 2831b
In-book reference : Book 53, Hadith 13
USC-MSA web (English) reference : Book 40, Hadith 6790
  (deprecated numbering scheme)