question #3 Sahih al-Bukhari 5915, Book 77, Hadith 130 : Why is it important to maintain the original words of the Talbiyah without additions during pilgrimage?

I heard Allah’s Messenger (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.