Sahih Muslim 632
Sahih Muslim · Book 5: The Book of Mosques and Places of Prayer · The virtue of the Subh and the `Asr prayers, and of maintaining them
Abu Huraira reported Allah's Messenger (ﷺ) as saying:
وَحَدَّثَنَا مُحَمَّدُ بْنُ رَافِعٍ ، حَدَّثَنَا عَبْدُ الرَّزَّاقِ ، حَدَّثَنَا مَعْمَرٌ ، عَنْ هَمَّامِ بْنِ مُنَبِّهٍ ، عَنْ أَبِي هُرَيْرَةَ ، عَنِ النَّبِيِّ صلى الله عليه وسلم قَالَ " وَالْمَلاَئِكَةُ يَتَعَاقَبُونَ فِيكُمْ " . بِمِثْلِ حَدِيثِ أَبِي الزِّنَادِ .
Angels take turns among you by night and by day, and the rest of the hadith is the same.