كتاب الْمَسَاجِدِ وَمَوَاضِعِ الصَّلاَةِ
5  
The Book of Mosques and Places of Prayer
(42)
Chapter: The virtue of prayer in congregation, and clarifying the stern warning against staying away from it, and that it is fard kifayah
(42)
باب فَضْلِ صَلاَةِ الجَمَاعَةِ وَبَيَانِ التَّشْدِيدِ فِي التَّخَلُّفِ عَنْهَا ‏
Sahih Muslim 649 b

Abu Huraira reported Allah's Apostle (ﷺ) as saying:

Prayer said in a congregation is twenty-five degrees more excellent than prayer said by a single person. He (Abu Huraira further) said: The angels of the night and the angels of the day meet together. Abu Huraira said: Recite it you like:" Surely the recital of the Qur'an at dawn is witnessed" (al-Qur'an, xvii. 78).
حَدَّثَنَا أَبُو بَكْرِ بْنُ أَبِي شَيْبَةَ، حَدَّثَنَا عَبْدُ الأَعْلَى، عَنْ مَعْمَرٍ، عَنِ الزُّهْرِيِّ، عَنْ سَعِيدِ بْنِ الْمُسَيَّبِ، عَنْ أَبِي هُرَيْرَةَ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ ‏"‏ تَفْضُلُ صَلاَةٌ فِي الْجَمِيعِ عَلَى صَلاَةِ الرَّجُلِ وَحْدَهُ خَمْسًا وَعِشْرِينَ دَرَجَةً ‏"‏ ‏.‏ قَالَ ‏"‏ وَتَجْتَمِعُ مَلاَئِكَةُ اللَّيْلِ وَمَلاَئِكَةُ النَّهَارِ فِي صَلاَةِ الْفَجْرِ ‏"‏ ‏.‏ قَالَ أَبُو هُرَيْرَةَ اقْرَءُوا إِنْ شِئْتُمْ ‏{‏ وَقُرْآنَ الْفَجْرِ إِنَّ قُرْآنَ الْفَجْرِ كَانَ مَشْهُودًا‏}
Reference : Sahih Muslim 649b
In-book reference : Book 5, Hadith 306
USC-MSA web (English) reference : Book 4, Hadith 1361
  (deprecated numbering scheme)