Musnad Ahmad 670:1

Muhammad ibn Ja‘far narrated to us, Shu‘bah narrated to us, from Bukayr ibn ‘Ata’, who said: I heard ‘Abd al-Rahman ibn Ya‘mar say: I heard the Messenger of Allah, peace and blessings of Allah be upon him, and a man asked him about the Hajj at ‘Arafah. He said: "The Hajj is the day of ‘Arafah or ‘Arafat. Whoever catches the night of Jam‘ (Muzdalifah) before the morning prayer, his Hajj is complete. And the days of Mina are three; so whoever hastens in two days, there is no sin upon him, and whoever delays, there is no sin upon him."