I heard Messenger of Allah ﷺ, while he was in the state of lhram 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. (Using translation from Bukhārī 5915)
سَمِعْتُ رَسُولَ اللهِ ﷺ يُهِلُّ مُلَبِّدًا يَقُولُ لَبَّيْكَ اللهُمَّ لَبَّيْكَ لَبَّيْكَ لَا شَرِيكَ لَكَ لَبَّيْكَ إِنَّ الْحَمْدَ وَالنِّعْمَةَ لَكَ وَالْمُلْكَ لَا شَرِيكَ لَكَ لَا يَزِيدُ عَلَى هَؤُلَاءِ الْكَلِمَاتِ