Sahih al-Bukhari, Volume 2, Book 26, Hadith 624 (USC-MSA) ⓘ
Narrated Ibn `Umar: The Prophet (p.b.u.h) recited Talbiya when he had mounted his Mount and was ready to set out.
حَدَّثَنَا أَبُو عَاصِمٍ، أَخْبَرَنَا ابْنُ جُرَيْجٍ، قَالَ أَخْبَرَنِي صَالِحُ بْنُ كَيْسَانَ، عَنْ نَافِعٍ، عَنِ ابْنِ عُمَرَ ـ رضى الله عنهما ـ قَالَ أَهَلَّ النَّبِيُّ صلى الله عليه وسلم حِينَ اسْتَوَتْ بِهِ رَاحِلَتُهُ قَائِمَةً.
also referenced under: Book 25, Hadith 38 (In-Book) & Hadith 1552 (DarusSalam)