Abu Hurayrah (may Allah be pleased with him) says that the Prophet (peace and blessings be upon him) said: "Your Eid is the day on which you break the fast, and your day of sacrifice is the day on which you offer your sacrifices; the plain of Arafah is a place of standing, and all of Mina is a place of sacrifice. All the paths of Makkah are a place of sacrifice, and all of Muzdalifah is a place of standing."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب صلاة العيدين / 6285