Sahih Bukhari Volume 2, Book 25, Hadith 1661

حَدَّثَنَا عَبْدُ اللَّهِ بْنُ يُوسُفَ، أَخْبَرَنَا مَالِكٌ، عَنِ ابْنِ شِهَابٍ، عَنْ سَالِمٍ، قَالَ كَتَبَ عَبْدُ الْمَلِكِ إِلَى الْحَجَّاجِ أَنْ لاَ يُخَالِفَ ابْنَ عُمَرَ فِي الْحَجِّ، فَجَاءَ ابْنُ عُمَرَ ـ رضى الله عنه ـ وَأَنَا مَعَهُ يَوْمَ عَرَفَةَ حِينَ زَالَتِ الشَّمْسُ، فَصَاحَ عِنْدَ سُرَادِقِ الْحَجَّاجِ، فَخَرَجَ وَعَلَيْهِ مِلْحَفَةٌ مُعَصْفَرَةٌ فَقَالَ مَا لَكَ يَا أَبَا عَبْدِ الرَّحْمَنِ فَقَالَ الرَّوَاحَ إِنْ كُنْتَ تُرِيدُ السُّنَّةَ‏.‏ قَالَ هَذِهِ السَّاعَةَ قَالَ نَعَمْ‏.‏ قَالَ فَأَنْظِرْنِي حَتَّى أُفِيضَ عَلَى رَأْسِي ثُمَّ أَخْرُجَ‏.‏ فَنَزَلَ حَتَّى خَرَجَ الْحَجَّاجُ، فَسَارَ بَيْنِي وَبَيْنَ أَبِي، فَقُلْتُ إِنْ كُنْتَ تُرِيدُ السُّنَّةَ فَاقْصُرِ الْخُطْبَةَ وَعَجِّلِ الْوُقُوفَ‏.‏ فَجَعَلَ يَنْظُرُ إِلَى عَبْدِ اللَّهِ، فَلَمَّا رَأَى ذَلِكَ عَبْدُ اللَّهِ قَالَ صَدَقَ‏.

Narrated By Salim : 'Abdul Malik wrote to Al-Hajjaj that he should not differ from Ibn 'Umar during Hajj. On the Day of 'Arafat, when the sun declined at midday, Ibn 'Umar came along with me and shouted near Al-Hajjaj's cotton (cloth) tent. Al-Hajjaj came Out, wrapping himself with a waist-sheet dyed with safflower, and said, "O Abu Abdur-Rahman! What is the matter?" He said, If you want to follow the Sunna (the tradition of the Prophet (p.b.u.h)) then proceed (to 'Arafat)." Al-Hajjaj asked, "At this very hour?" Ibn 'Umar said, "Yes." He replied, "Please wait for me till I pour some water over my head (i.e. take a bath) and come out." Then Ibn 'Umar dismounted and waited till Al-Hajjaj came out. So, he (Al-Hajjaj) walked in between me and my father (Ibn 'Umar). I said to him, "If you want to follow the Sunna then deliver a brief sermon and hurry up for the stay at 'Arafat." He started looking at 'Abdullah (Ibn 'Umar) (inquiringly), and when 'Abdullah noticed that, he said that he had told the truth.