Musannaf Ibn Abi Shaybah

Hazrat Aswad narrates that Hazrat Umar was riding a red camel on the evening of Arafah, and he recited the Talbiyah three times in these words: "Labbayk Allahumma Labbayk, Labbayk La Sharika Laka Labbayk, Innal Hamda Wan-Ni'mata Laka." And Hazrat Umar was moving quite fast, and whenever he passed by a hill, he would raise his hands and recite Takbeer.