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Narrated Ibn `Umar:I heard Allah's Apostle, while he was in the state of lhram and his hair was stuck together with gum, saying, "Labbaik, Allahumma Labbaik, Labbaik La Shanka laka Labbaik. Inn-al-Hamda Wan-Ni'mata Laka wal-Mulk, La Shanka Lak." He did not add anything to those words. (See Hadith No. 621, Vol. 2)