حَدَّثَنِي يَحْيَى، عَنْ مَالِكٍ، أَنَّهُ بَلَغَهُ أَنَّ رَسُولَ اللَّهِ صلى الله عليه وسلم قَالَ ‏"‏ عَرَفَةُ كُلُّهَا مَوْقِفٌ وَارْتَفِعُوا عَنْ بَطْنِ عُرَنَةَ وَالْمُزْدَلِفَةُ كُلُّهَا مَوْقِفٌ وَارْتَفِعُوا عَنْ بَطْنِ مُحَسِّرٍ ‏"‏ ‏.‏

Yahya related to me from Malik that he had heard that theMessenger of Allah, may Allah bless him and grant him peace, said,"The whole of Arafa is a mawqif, except the middle of Urana, and thewhole of Muzdalifa is a standing-place, except for the middle ofMuhassir." Translation Not Available

Book Ref: Muwatta Imam Malik Book 20 Hadith 876
Web Ref:  Muwatta Imam Malik Book 20 Hadith 175