Sahih Muslim Book - 6, Hadith - 1927

وَحَدَّثَنَا قُتَيْبَةُ بْنُ سَعِيدٍ حَدَّثَنَا لَيْثٌ عَنْ خَيْرِ بْنِ نُعَيْمٍ الْحَضْرَمِىِّ عَنِ ابْنِ هُبَيْرَةَ عَنْ أَبِى تَمِيمٍ الْجَيْشَانِىِّ عَنْ أَبِى بَصْرَةَ الْغِفَارِىِّ قَالَ صَلَّى بِنَا رَسُولُ اللَّهِ -صلى الله عليه وسلم- الْعَصْرَ بِالْمُخَمَّصِ فَقَالَ « إِنَّ هَذِهِ الصَّلاَةَ عُرِضَتْ عَلَى مَنْ كَانَ قَبْلَكُمْ فَضَيَّعُوهَا فَمَنْ حَافَظَ عَلَيْهَا كَانَ لَهُ أَجْرُهُ مَرَّتَيْنِ وَلاَ صَلاَةَ بَعْدَهَا حَتَّى يَطْلُعَ الشَّاهِدُ ». وَالشَّاهِدُ النَّجْمُ.

It was narrated that Abu Basrah Al-Ghifari said: "The Messenger of Allah (s.a.w) led us in praying 'Asr at Al-Makhmis, and he said: 'This prayer was enjoined upon those who came before you, but they neglected it. Whoever performs it regularly will have a twofold reward, and there is no prayer after it until the Shahid appears' - and the Shahid means the stars."