Sayyiduna Urwah bin Mudarris (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) and said: "I am exhausted, I have endured hardship, and I have done such-and-such." The Messenger of Allah (peace and blessings be upon him) said: "Whoever reaches Muzdalifah and stands with the people until they depart has caught the Hajj; and whoever does not catch that, his Hajj has not been accomplished."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14456