Sayyiduna Urwah bin Mudarris al-Ta'i (may Allah be pleased with him) said: I came to the Prophet (peace and blessings be upon him) while he (peace and blessings be upon him) was standing at Muzdalifah, and I said: "O Messenger of Allah! I have come from the mountain of Tayyi'. I have worn out my mount and exhausted myself. By Allah! On every mountain I came down at, I stood there. So has my Hajj been accomplished?" The Messenger of Allah (peace and blessings be upon him) said: "Whoever catches this prayer with us, having already come to Arafat before that, by night or by day, he has removed his grime (completed his rites) and his Hajj is complete."
Hadith Referenceالمعجم الكبير للطبراني / باب العين / 14459