Sayyiduna Abd al-Rahman bin Ya'mar al-Dili (may Allah be pleased with him) said: I saw the Messenger of Allah (peace and blessings be upon him) standing at Arafat. Some people of Najd came to him (peace and blessings be upon him) and asked about Hajj, and he (peace and blessings be upon him) said: "Hajj is the Day of Arafah. Whoever reaches it before the Fajr prayer has attained Hajj. The days of Mina are the three days of Tashriq. Whoever hastens (to leave) in two days, there is no sin upon him, and whoever delays, there is no sin upon him either."
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9683