Sunan of Abu Dawood Book 11, Hadith 1910

حَدَّثَنَا هَنَّادٌ، عَنْ أَبِي مُعَاوِيَةَ، عَنْ هِشَامِ بْنِ عُرْوَةَ، عَنْ أَبِيهِ، عَنْ عَائِشَةَ، قَالَتْ كَانَتْ قُرَيْشٌ وَمَنْ دَانَ دِينَهَا يَقِفُونَ بِالْمُزْدَلِفَةِ وَكَانُوا يُسَمَّوْنَ الْحُمْسَ وَكَانَ سَائِرُ الْعَرَبِ يَقِفُونَ بِعَرَفَةَ قَالَتْ فَلَمَّا جَاءَ الإِسْلاَمُ أَمَرَ اللَّهُ تَعَالَى نَبِيَّهُ صلى الله عليه وسلم أَنْ يَأْتِيَ عَرَفَاتٍ فَيَقِفَ بِهَا ثُمَّ يُفِيضَ مِنْهَا فَذَلِكَ قَوْلُهُ تَعَالَى ‏{‏ ثُمَّ أَفِيضُوا مِنْ حَيْثُ أَفَاضَ النَّاسُ ‏}‏ ‏.‏

A'ishah said "Quraish and those who followed their religion used to station at Al Muzdalifah and they were called Al Hums and the rest of Arabs used to station at ‘Arafah. When Islam came, Allaah the most High commanded His Prophet (ﷺ) to go to ‘Arafah and station there then go quickly from it. That is in accordance with the words of Him Who is exalted "Then go quickly from where the people went quickly."