Muwatta Malik, Book 20, Hadith 876 (In-Book)

Yahya related to me from Malik that he had heard that the Messenger of Allah, may Allah bless him and grant him peace, said, "The whole of Arafa is a mawqif, except the middle of Urana, and the whole of Muzdalifa is a standing-place, except for the middle of Muhassir."

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 ‏" ‏ ‏.‏

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also referenced under: Book 20, Hadith 175 (USC-MSA)