Assalam Aleykum,
Imam Mahdi Nasser Mohamed ( peace be upon him and his family as well as all prophets from first to the last one) says: "That is His word the Most High: {the Quran at dawn. Surely the recital of the Quran at dawn is witnessed.}Truthful Allah the Great [Al-Esrã`a] 17:78
{وَقُرْآنَ الْفَجْرِ إِنَّ قُرْآنَ الْفَجْرِ كَانَ مَشْهُودًا} صدق الله العظيم [الإسراء:٧٨].
Therefore Fajr prayer is the middle prayer and it is witnessed by the angels of night (at the time of changing) turn and handing over to the angels of day-time and they are the consequences by night and day."
As you can see, angles of nigh and day-time have been mentioned above. Who are they: angels of the night and day-time?
Thank you.