وَعَنْ أَنَسٍ عَنِ النَّبِيِّ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ قَالَ:" لَا تَزَالُ جَهَنَّمَ يُلْقَى فِيهَا وَتَقُولُ: هَلْ مِنْ مَزِيدٍ؟ حَتَّى يَضَعَ رَبُّ العزَّةِ فِيهَا قدَمَه فينزَوي بَعْضُهَا إِلَى بَعْضٍ فَتَقُولُ: قَطْ قَطْ بِعِزَّتِكَ وَكَرَمِكَ وَلَا يَزَالُ فِي الْجَنَّةِ فَضْلٌ حَتَّى يُنْشِئَ اللَّهُ لَهَا خَلْقًا فَيُسْكِنُهُمْ فَضْلَ الْجَنَّةِ ". مُتَّفق عَلَيْهِ
Translation

Anas reported the Prophet as saying, "Hell will continue to have people thrown into it and ask if there are any more[*] till the Lord of might puts down His foot on it and its parts are collected together. It will then say, `Enough, enough, by Thy might and generosity.' In paradise there will continue to be more room till God creates people for it and causes them to dwell in the extra space in paradise." *Quran; 1:30(Bukhari and Muslim.)