Ibn Umar (may Allah be pleased with him) says: I heard the Messenger of Allah (peace and blessings be upon him) reciting this talbiyah: "Labbayk Allahumma labbayk, labbayk 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. Indeed, all praise and blessing are Yours, and the dominion; You have no partner). He would not say more than these words. And Ibn Umar (may Allah be pleased with him) says that the Messenger of Allah (peace and blessings be upon him) would pray two rak'ahs at Dhul-Hulayfah; then, when his she-camel stood up with him near the mosque of Dhul-Hulayfah, he (peace and blessings be upon him) recited this same talbiyah.
(b) And Umar bin al-Khattab (may Allah be pleased with him) would recite the talbiyah of the Prophet (peace and blessings be upon him) with these same words, and would say: 'Labbayk Allahumma labbayk, labbayk wa sa'dayk, wa al-khayru fi yadayk, labbayk wa al-raghba'u ilayka wa al-'amal' (Here I am, O Allah, here I am; here I am, and blessed am I with You; all good is in Your hands; here I am, and all longing is towards You, and deeds as well).
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الحج / 9028