Musnad Ahmad 32:2058

Muhammad ibn Ja'far narrated to us, Shu'bah narrated to us, he said: Humayd al-Tawil informed me, from Anas, he said: I heard the Messenger of Allah, peace and blessings of Allah be upon him, saying: "Labbayk (I am here) for an 'Umrah and a Hajj together." Or he said: The Messenger of Allah, peace and blessings of Allah be upon him, said: [the same].