Sayyiduna Abu Hurayrah (may Allah be pleased with him) narrates from the Prophet (peace and blessings be upon him) as a marfu' report: "Your day of Eid al-Fitr is the day on which you break the fast, and your day of Eid al-Adha is the day on which you sacrifice. The whole plain of Arafah is a place of standing, the whole plain of Muzdalifah is also a place of standing, the whole of Mina is a place of sacrifice, and all the roads of Makkah are places of sacrifice."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9826