The التلبية is the declaration recited upon entering الإحرام: 'Labbayk Allahumma labbayk, labbayka la sharika laka labbayk. Innal-hamda wan-ni'mata laka wal-mulk, la sharika lak.' It affirms the الحاج's response to Allah's call and is recited continuously from الإحرام until the stoning of Jamrat al-Aqabah.
لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ، لَبَّيْكَ لَا شَرِيكَ لَكَ لَبَّيْكَ، إِنَّ الْحَمْدَ وَالنِّعْمَةَ لَكَ وَالْمُلْكَ، لَا شَرِيكَ لَكَ
Labbayk Allahumma labbayk, labbayka la sharika laka labbayk. Innal-hamda wan-ni'mata laka wal-mulk, la sharika lak.
Meaning: Here I am, O Allah, here I am. Here I am, You have no partner, here I am. Verily all praise, grace, and sovereignty belong to You. You have no partner.
Source: Sahih al-Bukhari #1549النبي (صلى الله عليه وسلم) said: 'There is no Muslim who recites the التلبية but that which is to his right and left — trees, rocks, and earth — also recites the التلبية, all the way to the end of the earth in both directions.' (سنن الترمذي 828)
لَبَّيْكَ اللَّهُمَّ لَبَّيْكَ، لَبَّيْكَ لَا شَرِيكَ لَكَ لَبَّيْكَ، إِنَّ الْحَمْدَ وَالنِّعْمَةَ لَكَ وَالْمُلْكَ، لَا شَرِيكَ لَكَ
The Talbiyah of the Messenger of Allah (peace be upon him) was: 'Labbayk Allahumma labbayk, labbayka la sharika laka labbayk. Innal-hamda wan-ni'mata laka wal-mulk, la sharika lak.'