Musnad Ahmad 33:814

'Affan narrated to us, Hammad bin Zayd narrated to us, Ayyub narrated to us, Mujahid narrated to us, from Jabir, who said: "We arrived with the Messenger of Allah, may Allah bless him and grant him peace, and we were saying: 'Labbayk for Hajj.' Then he commanded us, so we made it an 'Umrah."