Musnad Abu Ya'la al-Mawsili 154:186

Abu al-Rabi' al-Zahrani narrated to us, Malik bin Anas narrated to us, from Nafi', from Ibn Umar, who said: The talbiyah of the Messenger of Allah (peace and blessings of Allah be upon him) was: "Labbayk Allahumma labbayk, labbayka la sharika laka labbayk, inna al-hamda wa al-ni'mata laka wa al-mulk, la sharika lak" (Here I am, O Allah, here I am. Here I am, You have no partner, here I am. Verily, all praise and grace are Yours, and the dominion; You have no partner).