كتاب الجمعة
7  
The Book of Prayer - Friday
(7)
Chapter: The virtue of going out early on Friday
(7)
باب فَضْلِ التَّهْجِيرِ يَوْمَ الْجُمُعَةِ ‏
Sahih Muslim 850 d

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

There is an angel on every door of the mosque recording him first who (comes) first (to the mosque for Friday prayer). And he [the Prophet] likened him to one who offers a camel as a sacrifice and then he went on in the descending order till he reached the point at which the minimum (sacrifice) is that of an egg. And when the Imam sits (on the pulpit) the sheets are folded and they (the angels) attend to the mention of Allah.
وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ، حَدَّثَنَا يَعْقُوبُ، - يَعْنِي ابْنَ عَبْدِ الرَّحْمَنِ - عَنْ سُهَيْلٍ، عَنْ أَبِيهِ، عَنْ أَبِي هُرَيْرَةَ، أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏ "‏ عَلَى كُلِّ بَابٍ مِنْ أَبْوَابِ الْمَسْجِدِ مَلَكٌ يَكْتُبُ الأَوَّلَ فَالأَوَّلَ - مَثَّلَ الْجَزُورَ ثُمَّ نَزَّلَهُمْ حَتَّى صَغَّرَ إِلَى مَثَلِ الْبَيْضَةِ - فَإِذَا جَلَسَ الإِمَامُ طُوِيَتِ الصُّحُفُ وَحَضَرُوا الذِّكْرَ ‏"‏ ‏.
Reference : Sahih Muslim 850d
In-book reference : Book 7, Hadith 36
USC-MSA web (English) reference : Book 4, Hadith 1866
  (deprecated numbering scheme)