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.
Bukhari
Hajj (Pilgrimage) • Hadith 144