Sahih al-Bukhari, Volume 2, Book 26, Hadith 724 (USC-MSA) ⓘ

Ibn Shihab said: Salim said, "In the year when Al-Hajjaj bin Yusuf attacked Ibn Az-Zubair, the former asked 'Abdullah (Ibn 'Umar) what to do during the stay on the Day of 'Arafa (9th of Dhul-Hajjah). I said to him, "If you want to follow the Sunna (the legal way of the Prophet) you should offer the Salat just after midday on the Day of the 'Arafa. 'Abdullah bin 'Umar said, 'He (Salim) has spoken the truth.' " They (the Companions of the Prophet) used to offer the Zuhr and Asr prayer together according to the Sunna, I asked Salim, "Did Allah's Messenger do that ?" Salim said, "And in doing that do you (people) follow anything else except his Sunna?"

وَقَالَ اللَّيْثُ حَدَّثَنِي عُقَيْلٌ، عَنِ ابْنِ شِهَابٍ، قَالَ أَخْبَرَنِي سَالِمٌ، أَنَّ الْحَجَّاجَ بْنَ يُوسُفَ، عَامَ نَزَلَ بِابْنِ الزُّبَيْرِ ـ رضى الله عنهما ـ سَأَلَ عَبْدَ اللَّهِ ـ رضى الله عنه ـ كَيْفَ تَصْنَعُ فِي الْمَوْقِفِ يَوْمَ عَرَفَةَ فَقَالَ سَالِمٌ إِنْ كُنْتَ تُرِيدُ السُّنَّةَ فَهَجِّرْ بِالصَّلاَةِ يَوْمَ عَرَفَةَ‏.‏ فَقَالَ عَبْدُ اللَّهِ بْنُ عُمَرَ صَدَقَ‏.‏ إِنَّهُمْ كَانُوا يَجْمَعُونَ بَيْنَ الظُّهْرِ وَالْعَصْرِ فِي السُّنَّةِ‏.‏ فَقُلْتُ لِسَالِمٍ أَفَعَلَ ذَلِكَ رَسُولُ اللَّهِ صلى الله عليه وسلم فَقَالَ سَالِمٌ وَهَلْ تَتَّبِعُونَ فِي ذَلِكَ إِلاَّ سُنَّتَهُ

Narrated Salim bin `Abdullah bin `Umar: `Abdul-Malik bin Marwan wrote to Al-Hajjaj that he should follow `Abdullah bin `Umar in all the ceremonies of Hajj. So when it was the Day of `Arafat (9th of Dhul-Hijja), and after the sun has deviated or has declined from the middle of the sky, I and Ibn `Umar came and he shouted near the cotton (cloth) tent of Al-Hajjaj, "Where is he?" Al-Hajjaj came out. Ibn `Umar said, "Let us proceed (to `Arafat)." Al-Hajjaj asked, "Just now?" Ibn `Umar replied, "Yes." Al-Hajjaj said, "Wait for me till I pour water on me (i.e. take a bath)." So, Ibn `Umar dismounted (and waited) till Al-Hajjaj came out. He was walking between me and my father. I informed Al-Hajjaj, "If you want to follow the Sunna today, then you should shorten the sermon and then hurry up for the stay (at `Arafat)." Ibn `Umar said, "He (Salim) has spoken the truth."

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ مَسْلَمَةَ، أَخْبَرَنَا مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمِ بْنِ عَبْدِ اللَّهِ، أَنَّ عَبْدَ الْمَلِكِ بْنَ مَرْوَانَ، كَتَبَ إِلَى الْحَجَّاجِ أَنْ يَأْتَمَّ، بِعَبْدِ اللَّهِ بْنِ عُمَرَ فِي الْحَجِّ، فَلَمَّا كَانَ يَوْمُ عَرَفَةَ جَاءَ ابْنُ عُمَرَ ـ رضى الله عنهما ـ وَأَنَا مَعَهُ حِينَ زَاغَتِ الشَّمْسُ أَوْ زَالَتْ، فَصَاحَ عِنْدَ فُسْطَاطِهِ أَيْنَ هَذَا فَخَرَحَ إِلَيْهِ فَقَالَ ابْنُ عُمَرَ الرَّوَاحَ‏.‏ فَقَالَ الآنَ قَالَ نَعَمْ‏.‏ قَالَ أَنْظِرْنِي أُفِيضُ عَلَىَّ مَاءً‏.‏ فَنَزَلَ ابْنُ عُمَرَ ـ رضى الله عنهما ـ حَتَّى خَرَجَ، فَسَارَ بَيْنِي وَبَيْنَ أَبِي‏.‏ فَقُلْتُ إِنْ كُنْتَ تُرِيدُ أَنْ تُصِيبَ السُّنَّةَ الْيَوْمَ فَاقْصُرِ الْخُطْبَةَ وَعَجِّلِ الْوُقُوفَ‏.‏ فَقَالَ ابْنُ عُمَرَ صَدَقَ‏.‏