Musnad Ahmad 512:2

Waki' narrated to us, Mis'ar narrated to us, from 'Abd al-Malik ibn Maysarah, from Tawus, from Suraqah ibn Malik ibn Ju'sham, who said: The Messenger of Allah (peace and blessings of Allah be upon him) stood as a preacher in the valley and said: "Behold, the 'Umrah has entered into the Hajj until the Day of Resurrection."