Musnad Ahmad 30:3843

Muhammad ibn Mus'ab narrated to us, al-Awza'i narrated to us, from al-Zuhri, from Hanzalah ibn 'Ali, from Abu Hurayrah, that the Prophet, peace and blessings of Allah be upon him, said: "By the One in whose hand is my soul, the son of Mary shall certainly pronounce the Talbiyah (saying 'Labbayk') in the mountain pass of al-Rawha', as a pilgrim performing Hajj, or as one performing 'Umrah."