Al-Suddi (may Allah have mercy on him) said: I asked Sa'id bin Jubayr (may Allah have mercy on him) about al-Mash'ar al-Haram, and he said: It is what lies between the two mountains of Muzdalifah.
Ata' bin Abi Rabah (may Allah have mercy on him) said: I think that the Prophet (peace and blessings be upon him) stayed on the night of Jam' (Muzdalifah) at the place where the imams now stay.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9507