Musnad Abu Ya'la al-Mawsili 39:1

Zahmūyah narrated to us, Sālih—meaning Ibn ‘Umar—narrated to us, from Mutarrif, from ‘Āmir, from ‘Urwah ibn Mudarris, who said: I came to the Messenger of Allah (peace be upon him) and said: "O Messenger of Allah, I have exhausted my riding beast." The Messenger of Allah (peace be upon him) said: "Whoever reaches Jam‘ (Muzdalifah) and stands with the Imam until he departs, he has attained the Hajj. And whoever does not reach Jam‘, there is no Hajj for him."