Musnad Abu Ya'la al-Mawsili 112:13

Muhammad ibn Abdullah ibn Numayr narrated to us, my father narrated to us, Ismail narrated to us, from al-Hasan and Qatadah, from Anas: That the Prophet, peace and blessings of Allah be upon him, used to recite the Talbiyah: "Labbayk Allahumma Labbayk, Labbayk la sharika laka Labbayk, inna al-hamda wa an-ni'mata laka wa al-mulk, la sharika lak" (Here I am, O Allah, here I am. Here I am, there is no partner for You, here I am. Indeed, all praise and grace are Yours, and the dominion; there is no partner for You).