Musnad Abu Ya'la al-Mawsili 150:167

Muhammad ibn Abdullah ibn Numayr narrated to us, my father narrated to us, al-A'mash narrated to us, from 'Umarah, from Abu 'Atiyyah, from 'Aishah, who said: "I indeed know how the Messenger of Allah (may Allah bless him and grant him peace) used to recite the Talbiyah. He used to recite: 'Labbayka Allahumma Labbayk, Labbayka la sharika laka Labbayk, inna al-hamda wa an-ni'mata laka' (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 belong to You)."