كتاب الحج
15  
The Book of Pilgrimage
(21)
Chapter: The Standing and the Saying of Allah, The Most High: "Then depart from the place whence all the people depart"
(21)
باب فِي الْوُقُوفِ وَقَوْلِهِ تَعَالَى ‏{‏ ثُمَّ أَفِيضُوا مِنْ حَيْث أَفَاضَ النَّاسُ}
Sahih Muslim 1219 a

'A'isha (Allah be pleased with her) reported that the Quraish (of the pre-Islamic days) and those who followed their religions practices stayed at Muzdalifa, and they named themselves as Hums, whereas all other Arabs stayed at 'Arafa. With the advent of Islam, Allah, the Exalted and Glorious, commanded His Apostle (ﷺ) to come to 'Arafat and stay there, and then hurry from there, and this is the significance of the words of Allah:

" Then hasten on from where the people hasten on."
حَدَّثَنَا يَحْيَى بْنُ يَحْيَى، أَخْبَرَنَا أَبُو مُعَاوِيَةَ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، - رضى الله عنها - قَالَتْ كَانَ قُرَيْشٌ وَمَنْ دَانَ دِينَهَا يَقِفُونَ بِالْمُزْدَلِفَةِ وَكَانُوا يُسَمَّوْنَ الْحُمْسَ وَكَانَ سَائِرُ الْعَرَبِ يَقِفُونَ بِعَرَفَةَ فَلَمَّا جَاءَ الإِسْلاَمُ أَمَرَ اللَّهُ عَزَّ وَجَلَّ نَبِيَّهُ صلى الله عليه وسلم أَنْ يَأْتِيَ عَرَفَاتٍ فَيَقِفَ بِهَا ثُمَّ يُفِيضَ مِنْهَا فَذَلِكَ قَوْلُهُ عَزَّ وَجَلَّ ‏{‏ ثُمَّ أَفِيضُوا مِنْ حَيْثُ أَفَاضَ النَّاسُ‏}
Reference : Sahih Muslim 1219a
In-book reference : Book 15, Hadith 163
USC-MSA web (English) reference : Book 7, Hadith 2807
  (deprecated numbering scheme)