(28) Events of the Day of Resurrection and the Beginning of Creation
كتاب أحوال القيامة وبدء الخلق
(8a) Chapter: The Creation of Paradise and Hell - Section 1
(8) باب خلق الجنة والنار- الفصل الأول
Mishkat al-Masabih 5695 
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.)
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
Reference : Mishkat al-Masabih 5695
In-book reference : Book 28, Hadith 166