Amr bin Maymun (may Allah have mercy on him) said: I asked Sayyiduna Abdullah bin Amr (may Allah be pleased with him) about al-Mash'ar al-Haram while he was at Arafah, and he remained silent until he departed from there and the feet of the mounts began to scrape against those mountains; then he said: This is al-Mash'ar al-Haram. This is how it was said by Sayyiduna Abdullah bin Amr, or by Sayyiduna Abdullah bin Umar (may Allah be pleased with them).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9505