Narrated Abu Huraira: Allah’s Messenger (ﷺ) said, “(A group of) angels stay with you at night and (another group of) angels by daytime, and they gather at the time of ‘Asr and Fajr prayers. Then the angels who stayed with you overnight, ascend (to Heaven) and Allah asks them – and He knows everything – “In what state did you leave My servants?’ The angels reply, ‘When we left them, they were praying, and when we reached them they were praying.’ “
حَدَّثَنَا إِسْمَاعِيلُ، حَدَّثَنِي مَالِكٌ، عَنْ أَبِي الزِّنَادِ، عَنِ الأَعْرَجِ، عَنْ أَبِي هُرَيْرَةَ ـ رضى الله عنه ـ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ” يَتَعَاقَبُونَ فِيكُمْ مَلاَئِكَةٌ بِاللَّيْلِ وَمَلاَئِكَةٌ بِالنَّهَارِ، وَيَجْتَمِعُونَ فِي صَلاَةِ الْعَصْرِ وَصَلاَةِ الْفَجْرِ، ثُمَّ يَعْرُجُ الَّذِينَ بَاتُوا فِيكُمْ فَيَسْأَلُهُمْ وَهْوَ أَعْلَمُ بِكُمْ فَيَقُولُ كَيْفَ تَرَكْتُمْ عِبَادِي فَيَقُولُونَ تَرَكْنَاهُمْ وَهُمْ يُصَلُّونَ وَأَتَيْنَاهُمْ وَهُمْ يُصَلُّونَ ”.
Reference : Sahih al-Bukhari 7429
In-book reference : Book 97, Hadith 56
USC-MSA web (English) reference : Vol. 9, Book 93, Hadith 525