states in the holy Quran:

فَسُبۡحٰنَ اللّٰہِ  حِیۡنَ تُمۡسُوۡنَ وَ حِیۡنَ تُصۡبِحُوۡنَ )۱۷(

So proclaim the purity of Allah when you enter the morning and when you enter the evening.^[1]

Allah Almighty also says in Surah al-Rad:
لَہٗ مُعَقِّبٰتٌ مِّنۡۢ بَیۡنِ یَدَیۡہِ وَ مِنۡ خَلۡفِہٖ یَحۡفَظُوۡنَہٗ مِنۡ اَمۡرِ اللّٰہِ ؕ

For him there are alternating angels in front of him and behind him; they protect him with the command of Allah.^[2]

It is written in Tafsīr Ṣirāṭ al-Jinān in the commentary of this verse:
According to the majority of Quranic exegetes, this refers to the angels that provide protection day and night. They have been referred to as those who change and come in turns, because when the angels of the night arrive, those of the day depart, and when the angels of the day arrive, those of the night leave.^[3]
This changing of the angels takes place at the time of Fajr and ꜤAṣr. Those who offer these prayers, they have the added benefit of being in prayer at the time of the angels changing. Just as Sayyidunā Abū Hurayrah رَضِىَ الـلّٰـهُ عَـنْهُ narrates that the beloved Prophet صَلَّى الـلّٰـهُ عَلَيْهِ وَاٰلِهٖ وَسَلَّم said: “The angels of the day and night come to you in succession, and they gather at the time of Fajr and ꜤAṣr prayers. Then, those who have stayed with you ascend, and their Lord asks them, even though He is well-aware, “In which state did you leave My slaves?” The angels reply, “When we left them, they were