Sahih Bukhari

Narrated Ibn `Umar:I heard Allah's Messenger (ﷺ), while he was in the state of Ihram and his hair was stuck together with gum, saying, ""Labbaik, Allahumma Labbaik, Labbaik La Sharika laka Labbaik. Inn-al-Hamda Wan-Ni'mata Laka wal-Mulk, La Sharika Lak."" He did not add anything to those words