Language:
كتاب الحج
25  
Hajj (Pilgrimage)
(2)
Chapter: The Statement of Allah Most High: "Call ˹all˺ people to the pilgrimage.1 They will come to you on foot and on every lean camel from every distant path, so they may obtain the benefits ˹in store˺ for them, ..."
(2)
بَابُ قَوْلِ اللَّهِ تَعَالَى: {يَأْتُوكَ رِجَالاً وَعَلَى كُلِّ ضَامِرٍ يَأْتِينَ مِنْ كُلِّ فَجٍّ عَمِيقٍ لِيَشْهَدُوا مَنَافِعَ لَهُمْ}
Sahih al-Bukhari 1515

Narrated Jabir bin `Abdullah:

that Allah's Messenger (ﷺ) started saying, "Labbaik" from Dhul-Hulaifa when his Mount stood upright carrying him .

حَدَّثَنَا إِبْرَاهِيمُ، أَخْبَرَنَا الْوَلِيدُ، حَدَّثَنَا الأَوْزَاعِيُّ، سَمِعَ عَطَاءً، يُحَدِّثُ عَنْ جَابِرِ بْنِ عَبْدِ اللَّهِ ـ رضى الله عنهما ـ أَنَّ إِهْلاَلَ رَسُولِ اللَّهِ صلى الله عليه وسلم مِنْ ذِي الْحُلَيْفَةِ حِينَ اسْتَوَتْ بِهِ رَاحِلَتُهُ‏.‏ رَوَاهُ أَنَسٌ وَابْنُ عَبَّاسٍ رضى الله عنهم‏.‏
Reference : Sahih al-Bukhari 1515
In-book reference : Book 25, Hadith 3
USC-MSA web (English) reference : Vol. 2, Book 26, Hadith 591
  (deprecated numbering scheme)