Ata (may Allah have mercy on him) narrates from Sayyidah Aishah (may Allah be pleased with her) that the Prophet (peace and blessings be upon him) said: "One circumambulation after the standing at Arafah suffices you for your Hajj and your Umrah."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9810