It is narrated from Imam al-Hasan al-Basri (may Allah have mercy on him) that Sayyiduna Anas bin Malik (may Allah be pleased with him) said: "I learned the Talbiyah from the Messenger of Allah (peace and blessings be upon him): 'Labbayk Allahumma labbayk, labbayka la sharika laka labbayk, inna al-hamda wan-ni'mata laka wal-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 too; You have no partner)."
Hadith Referenceالمعجم الأوسط / باب الميم / 5039
Hadith Takhrij«أخرجه الضياء المقدسي فى «الأحاديث المختارة» برقم: 2622، وأبو يعلى فى «مسنده» برقم: 2768، 3563، والبزار فى «مسنده» برقم: 6705، وابن حجر فى «المطالب العالية» برقم: 1274»