It was narrated that Abu Basrah Al-Ghifari said:

"The Messenger of Allah ﷺ led us in praying 'Asr in Al-Mukhammas. He said: 'This prayer was enjoined upon those who came before you, but they neglected it. Whoever prays it regularly will have a two-fold reward, and there is no prayer after it until the Shahid appears." And the Shahid is "the star." [1]

[1] This is a statement of one of the narrators, and Allah knows best.

أَخْبَرَنَا قُتَيْبَةُ، قَالَ حَدَّثَنَا اللَّيْثُ، عَنْ خَيْرِ بْنِ نُعَيْمٍ الْحَضْرَمِيِّ، عَنِ ابْنِ هُبَيْرَةَ، عَنْ أَبِي تَمِيمٍ الْجَيْشَانِيِّ، عَنْ أَبِي بَصْرَةَ الْغِفَارِيِّ، قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ ﷺ الْعَصْرَ بِالْمُخَمَّصِ قَالَ " إِنَّ هَذِهِ الصَّلاَةَ عُرِضَتْ عَلَى مَنْ كَانَ قَبْلَكُمْ فَضَيَّعُوهَا وَمَنْ حَافَظَ عَلَيْهَا كَانَ لَهُ أَجْرُهُ مَرَّتَيْنِ وَلاَ صَلاَةَ بَعْدَهَا حَتَّى يَطْلُعَ الشَّاهِدُ " . وَالشَّاهِدُ النَّجْمُ .