Musnad Abu Ya'la al-Mawsili 154:62

'Abd al-Wahid ibn Ghiyath narrated to us, Salih al-Murri narrated to us, he said: I witnessed Bakr ibn 'Abd Allah al-Muzani, and a man asked him about the talbiyah of the Prophet, may Allah bless him and grant him peace. So he narrated to us from Ibn 'Umar that the Messenger of Allah, may Allah bless him and grant him peace, when he would recite the talbiyah, he would say: "Labbayka Allahumma labbayk, labbayka 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, there is no partner for You, at Your service; indeed, all praise and grace are Yours, and the dominion; there is no partner for You). Ibn 'Umar said: And he added: "Labbayka, labbayka, labbayka wa sa'dayk, wa al-khayru fi yadayk, labbayka wa al-raghba'u ilayk wa al-'amal" (At Your service, at Your service, at Your service and assisting You, and all good is in Your hands, at Your service, and the longing is toward You, and the deed).