(28) Events of the Day of Resurrection and the Beginning of Creation
كتاب أحوال القيامة وبدء الخلق
(5b) Chapter: Description of Paradise and its Inhabitants - Section 2
(5) باب صفة الجنة وأهلها - الفصل الثاني
Mishkat al-Masabih 5644 
Buraida reported God's messenger as saying, "The inhabitants of paradise will be in a hundred and twenty rows, eighty of them from this people and forty from the rest of the peoples," Tirmidhi, Darimi and Baihaqi, in Kitab al-ba'th wan nushur, transmitted it.
وَعَنْ بُرَيْدَةَ قَالَ: قَالَ رَسُولُ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ: «أَهْلُ الْجَنَّةِ عِشْرُونَ وَمِائَةُ صَفٍّ ثَمَانُونَ مِنْهَا مِنْ هَذِهِ الْأُمَّةِ وَأَرْبَعُونَ مِنْ سَائِرِ الْأُمَمِ» . رَوَاهُ التِّرْمِذِيُّ وَالدَّارِمِيُّ وَالْبَيْهَقِيُّ فِي كتاب الْبَعْث والنشور
Reference : Mishkat al-Masabih 5644
In-book reference : Book 28, Hadith 116