Mishkat al-Masabih, hadith 2506

وَعَن ابنِ شهابٍ قَالَ: أَخْبَرَنِي سَالِمٌ أَنَّ الْحَجَّاجَ بْنَ يُوسُفَ عَامَ نَزَلَ بِابْنِ الزُّبَيْرِ سَأَلَ عَبْدَ اللَّهِ: كَيْفَ نَصْنَعُ فِي الْمَوْقِفِ يَوْمَ عَرَفَةَ؟ فَقَالَ سَالِمٌ إِنْ كُنْتَ تُرِيدُ السُّنَّةَ فَهَجِّرْ بِالصَّلَاةِ يَوْمَ عَرَفَةَ فَقَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ: صَدَقَ إِنَّهُمْ كَانُوا يَجْمَعُونَ بَيْنَ الظُّهْرِ وَالْعَصْرِ فِي السُّنَّةِ فَقُلْتُ لِسَالِمٍ: أَفَعَلَ ذَلِكَ رَسُولَ اللَّهِ صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ؟ فَقَالَ سَالِمٌ: وَهل يتَّبعونَ فِي ذلكَ إِلا سنَّتَه؟ رَوَاهُ البُخَارِيّ

Ibn Shihab said Salim told him that in the year al-Hajjaj b. Yusuf attacked Ibn az-Zubair (Abdallah b. az-Zubair who was in Mecca had laid claims to the Caliphate. ‘Abd al-Malik, the Umayvad Caliph, sent an army under al-Hajjaj b. Yusuf towards the end of 72, A.H. to deal with Ibn az-Zubair, and although there had been fighting in the plain of ‘Arafat, hostilities ceased in order that the Pilgrimage might be observed, and were later resumed.) he asked ‘Abdallah (This is ‘Abdallah b. ‘Umar who is said to have been the one who was the means of having the hostilities stopped during the season of pilgrimage) how they were to act at the standing at ‘Arafa. Salim said, “If you wish to keep to the sunna, observe the prayer in the noonday heat on the day of ‘Arafa.” ‘Abdallah b. ‘Umar then said, “He has spoken the truth ; they were accustomed to combine the noon and the afternoon prayer in accordance with the sunna.” Ibn Shihab asked Salim whether God's messenger did that, and Salim replied, “In doing that do they follow anything but his sunna?” Bukhari transmitted it.