Musnad Ahmad 670:3

Rawh narrated to us, Shu'bah narrated to us, from Bukayr ibn 'Ata' al-Laythi, who said: I heard 'Abd al-Rahman ibn Ya'mar al-Dayli say: I heard the Messenger of Allah (peace and blessings of Allah be upon him) say—and a man asked him about the Hajj—he said: "The Hajj is the day of 'Arafat or 'Arafah. Whoever catches the night of Jam' (Muzdalifah) before praying the morning prayer, he has caught the Hajj. The days of Mina are three days. Whoever hastens in two days, there is no sin upon him, and whoever delays, there is no sin upon him."