Nasai

472. Commentary: The prayers of Asr and Fajr fall at difficult times. The time for Asr is a period of business and occupation, while the time for Fajr is one of sleep and heedlessness. Therefore, the person who performs these two prayers regularly in congregation will, all the more so, be regular in performing the remaining prayers. And prayer is the foundation of the religion; thus, such a person will be a steadfast believer, and therefore will never enter the Fire. And Allah knows best.

488. Commentary: In this hadith, there is no mention of congregational prayer (salat al-jama‘ah); only the prayers of Fajr and ‘Asr are mentioned. Thus, what is meant by performing the prayer is, in fact, performing the prayer in congregation. Praying individually or performing the prayer outside its prescribed time is not praiseworthy. (See hadith number 472)

427. Commentary:
This hadith highlights the special importance of the Fajr and Asr prayers. And it can be said that whoever is consistent in performing these prayers will also be consistent in performing the remaining prayers, or he will be granted the ability (tawfiq) to do so.

Benefit:
In these ahadith, the virtue and greatness of the Fajr and Asr prayers are mentioned, that during these prayers the angels of the day and night are present. Furthermore, these times are extremely blessed, such that whoever values these times and gives special attention to these prayers becomes purified from sins and is made an inheritor of Paradise.

Hafiz Ibn Hajar al-Asqalani rahimahullah states that “the Fajr and Asr prayers” are of the highest greatness because during these prayers both groups of angels are present, whereas in the other prayers only one group of angels is present. And it is also mentioned in the ahadith that after the Fajr prayer, sustenance is distributed, and at the end of the day, deeds are raised up. Thus, whoever is engaged in obedience and worship at these times, blessing is placed in his sustenance and deeds. (Fath al-Bari: 2/50)