Maliks Muwatta Book 20, Hadith Number 175.
Section : The Wuquf at Arata and Muzdalifa.
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.”