All of Arafat is a place of standing
حَدَّثَنَا عُمَرُ بْنُ حَفْصِ بْنِ غِيَاثٍ، حَدَّثَنَا أَبِي، عَنْ جَعْفَرٍ، حَدَّثَنِي أَبِي، عَنْ جَابِرٍ، فِي حَدِيثِهِ ذَلِكَ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ " نَحَرْتُ هَا هُنَا وَمِنًى كُلُّهَا مَنْحَرٌ فَانْحَرُوا فِي رِحَالِكُمْ وَوَقَفْتُ هَا هُنَا وَعَرَفَةُ كُلُّهَا مَوْقِفٌ وَوَقَفْتُ هَا هُنَا وَجَمْعٌ كُلُّهَا مَوْقِفٌ " .
Jabir reported Allah's Messenger (May peace be upon him) as saying: I have sacrificed (the animals) here, and the whole of Mini is a place for sacrifice; so sacrifice your animals at your places. 1 have stayed here (near these rocks), and the whole of Arafat is a place for stay. And I have stayed here (at Muzdalifa near Mash'ar al-Haram and the whole of Muzdalifa) is a place for stay (i. e. one is permitted to spend night in any part of it, as one likes).