حَدَّثَنِي زُهَيْرُ بْنُ حَرْبٍ، حَدَّثَنَا عَفَّانُ، حَدَّثَنَا حَمَّادٌ، - يَعْنِي ابْنَ سَلَمَةَ - أَخْبَرَنَا ثَابِتٌ، قَالَ سَمِعْتُ أَنسًا، يَقُولُ عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏ "‏ يَبْقَى مِنَ الْجَنَّةِ مَا شَاءَ اللَّهُ أَنْ يَبْقَى ثُمَّ يُنْشِئُ اللَّهُ تَعَالَى لَهَا خَلْقًا مِمَّا يَشَاءُ ‏"‏ ‏.‏

Anas reported Allah's Apostle (ﷺ) as saying: There would be left some space in Paradise as Allah would like that to be left. Then Allah would create another creation as He would like.

— Sahih Muslim, Book 53: The Book of Paradise, its Description, its Bounties and its Inhabitants, Hadith #7001