The Paradise and the Hell fell into dispute and the Hell said: 1 have been distinguished for accommodating (the haughty and proud in me), and the Paradise said: What is the matter that the meek and the humble and the downtrodden and simple would find an abode in me? Thereupon Allah said to Paradise: You are a (means) of My Mercy. 1 shall show mercy through you to one whom I will from amongst My servants. And lie said to the Hell: You are a (sign) of My chastisement and I shall chastise through you anyone whom I will from amongst My servants and both of you, would be full. And as regards the Hell it would not be full until Allah, the Exalted and Glorious, places His foot therein, and it would say: Enough, enough, enough, and it would be then full and the one part would draw very close to the other one and Allah would not treat unjustly anyone amongst His creation and He would create another creation for the Paradise (to accommodate it). (Using translation from Muslim 2846d)
وَقَالَ رَسُولُ اللهِ ﷺ تَحَاجَّتِ الْجَنَّةُ وَالنَّارُ فَقَالَتِ النَّارُ أُوثِرْتُ بِالْمُتَكَبِّرِينَ وَالْمُتَجَبِّرِينَ وَقَالَتِ الْجَنَّةُ فَمَا لِي لَا يَدْخُلُنِي إِلَّا ضُعَفَاءُ النَّاسِ وَسَفَلَتُهُمْ وَغِرَّتُهُمْ؟ فَقَالَ اللهُ ﷻ لِلْجَنَّةِ إِنَّمَا أَنْتِ رَحْمَتِي أَرْحَمُ بِكِ مَنْ أَشَاءُ مِنْ عِبَادِي وَقَالَ لِلنَّارِ إِنَّمَا أَنْتِ عَذَابِي أُعَذِّبُ بِكِ مَنْ أَشَاءُ مِنْ عِبَادِي وَلِكُلِّ وَاحِدَةٍ مِنْكُمَا مِلْؤُهَا فَأَمَّا النَّارُ فَلَا تَمْتَلِئُ حَتَّى يَضَعَ اللهُ ﷻرِجْلَهُ فَتَقُولُ قَطْ قَطْ أَيْ حَسْبِي فَهُنَالِكَ تَمْتَلِئُ وَيُزْوَى بَعْضُهَا إِلَى بَعْضٍ وَلَا يَظْلِمُ اللهُ مِنْ خَلْقِهِ أَحَدًا وَأَمَّا الْجَنَّةُ فَإِنَّ اللهَ يُنْشِئُ لَهَا خَلْقًا