Messenger of Allah ﷺ said, "Angels come to you in succession by night and day and all of them get together at the time of the Fajr and ʿAsr prayers. Those who have passed the night with you (or stayed with you) ascend (to the Heaven) and Allah asks them, though He knows everything about you, well, "In what state did you leave my slaves?" The angels reply: "When we left them they were praying and when we reached them, they were praying."  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ يَتَعَاقَبُونَ فِيكُمْ مَلاَئِكَةٌ بِاللَّيْلِ وَمَلاَئِكَةٌ بِالنَّهَارِ وَيَجْتَمِعُونَ فِي صَلاَةِ الْفَجْرِ وَصَلاَةِ الْعَصْرِ ثُمَّ يَعْرُجُ الَّذِينَ بَاتُوا فِيكُمْ فَيَسْأَلُهُمْ وَهْوَ أَعْلَمُ بِهِمْ كَيْفَ تَرَكْتُمْ عِبَادِي فَيَقُولُونَ تَرَكْنَاهُمْ وَهُمْ يُصَلُّونَ وَأَتَيْنَاهُمْ وَهُمْ يُصَلُّونَ  

Jarir said, "We were with the Prophet ﷺ and he looked at the moon--full-moon--and said, 'Certainly you will see your Lord as you see this moon and you will have no trouble in seeing Him. So if you can avoid missing (through sleep or business, etc.) a prayer before the sunrise (Fajr) and a prayer before sunset (ʿAsr), you must do so.' He then recited Allah's Statement: And celebrate the praises Of your Lord before the rising of the sun and before (its) setting." (50.39) Ismaʿil said, "Offer those prayers and do not miss them."  

كُنَّا عِنْدَ النَّبِيِّ ﷺ فَنَظَرَ إِلَى الْقَمَرِ لَيْلَةً يَعْنِي الْبَدْرَ فَقَالَ إِنَّكُمْ سَتَرَوْنَ رَبَّكُمْ كَمَا تَرَوْنَ هَذَا الْقَمَرَ لاَ تُضَامُّونَ فِي رُؤْيَتِهِ فَإِنِ اسْتَطَعْتُمْ أَنْ لاَ تُغْلَبُوا عَلَى صَلاَةٍ قَبْلَ طُلُوعِ الشَّمْسِ وَقَبْلَ غُرُوبِهَا فَافْعَلُوا ثُمَّ قَرَأَ {وَسَبِّحْ بِحَمْدِ رَبِّكَ قَبْلَ طُلُوعِ الشَّمْسِ وَقَبْلَ الْغُرُوبِ} قَالَ إِسْمَاعِيلُ افْعَلُوا لاَ تَفُوتَنَّكُمْ  

My father said, "Messenger of Allah ﷺ said, 'Whoever prays the two cool prayers (ʿAsr and Fajr) will go to Paradise.' "  

أَنَّ رَسُولَ اللَّهِ ﷺ قَالَ مَنْ صَلَّى الْبَرْدَيْنِ دَخَلَ الْجَنَّةَ وَقَالَ ابْنُ رَجَاءٍ حَدَّثَنَا هَمَّامٌ عَنْ أَبِي جَمْرَةَ أَنَّ أَبَا بَكْرِ بْنَ عَبْدِ اللَّهِ بْنِ قَيْسٍ أَخْبَرَهُ بِهَذَا حَدَّثَنَا إِسْحَاقُ عَنْ حَبَّانَ حَدَّثَنَا هَمَّامٌ حَدَّثَنَا أَبُو جَمْرَةَ عَنْ أَبِي بَكْرِ بْنِ عَبْدِ اللَّهِ عَنْ أَبِيهِ عَنِ النَّبِيِّ ﷺ مِثْلَهُ