Sahih Bukhari Volume 2, Book 26, Hadith Number 622.

Narated By ‘Aisha : I know how the Prophet used to say (Talbiya) and it was: ‘Labbaika Allahumma Labbaik, Labbaika la sharika Laka labbaik, Inna-l-hamda wan-ni’mata Laka walmu Lk, La sharika Laka’.