Musnad Ahmad 27:447

'Abd al-Razzaq narrated to us, Ma'mar informed us, from al-Zuhri, from Salim, from Ibn 'Umar, who said: I heard the Messenger of Allah (may Allah bless him and grant him peace) reciting the Talbiyah: "Labbayk Allahumma Labbayk, Labbayk la sharika laka Labbayk, inna al-hamda, wa al-ni'mata, laka wa al-mulk, la sharika lak." (At Your service, O Allah, at Your service. At Your service, You have no partner, at Your service. Indeed, all praise and grace are Yours, and the dominion; You have no partner.)