Sahih Muslim Book - 5, Hadith - 1430

وَحَدَّثَنِى أَبُو غَسَّانَ الْمِسْمَعِىُّ وَمُحَمَّدُ بْنُ الْمُثَنَّى عَنْ مُعَاذِ بْنِ هِشَامٍ - قَالَ أَبُو غَسَّانَ حَدَّثَنَا مُعَاذُ بْنُ هِشَامٍ - حَدَّثَنِى أَبِى عَنْ يَحْيَى بْنِ أَبِى كَثِيرٍ قَالَ حَدَّثَنَا أَبُو سَلَمَةَ بْنُ عَبْدِ الرَّحْمَنِ عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ أَنَّ عُمَرَ بْنَ الْخَطَّابِ يَوْمَ الْخَنْدَقِ جَعَلَ يَسُبُّ كُفَّارَ قُرَيْشٍ وَقَالَ يَا رَسُولَ اللَّهِ وَاللَّهِ مَا كِدْتُ أَنْ أُصَلِّىَ الْعَصْرَ حَتَّى كَادَتْ أَنْ تَغْرُبَ الشَّمْسُ. فَقَالَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- « فَوَاللَّهِ إِنْ صَلَّيْتُهَا ». فَنَزَلْنَا إِلَى بُطْحَانَ فَتَوَضَّأَ رَسُولُ اللَّهِ -صلى الله عليه وسلم- وَتَوَضَّأْنَا فَصَلَّى رَسُولُ اللَّهِ -صلى الله عليه وسلم- الْعَصْرَ بَعْدَ مَا غَرَبَتِ الشَّمْسُ ثُمَّ صَلَّى بَعْدَهَا الْمَغْرِبَ.

It was narrated from Jabir bin 'Abdullah that on the day of Al-Khandaq (i.e., the battle of Al-Ahzab), 'Umar bin Al-Khattab started cursing the disbelievers of the Quraish and said: "O Messenger of Allah, by Allah I could not pray 'Asr until the sun was about to set." The Messenger of Allah (s.a.w) said: "By Allah, I have not prayed either." We went down to Buthan, and the Messenger of Allah (s.a.w) performed Wudu' and so did we. Then the Messenger of Allah (s.a.w) prayed 'Asr after the sun had set, then he prayed Maghrib after that.