صحيح البخاري
Sahih Bukhari
كتاب الحج
The Book of Hajj
بَابُ قَوْلِ اللَّهِ تَعَالَى: {يَأْتُوكَ رِجَالاً وَعَلَى كُلِّ ضَامِرٍ يَأْتِينَ مِنْ كُلِّ فَجٍّ عَمِيقٍ لِيَشْهَدُوا مَنَافِعَ لَهُمْ} :
(2) Chapter. The Statement of Allah: “And proclaim to mankind the Hajj".
2 hadith
Hadith 1514
Narrated Ibn `Umar: I saw that Allah's Apostle used to ride on his Mount at Dhul Hulaifa and used to start saying, "Labbaik" when the Mount stood upright.
Hadith 1515
Narrated Jabir bin `Abdullah: that Allah's Apostle started saying, "Labbaik" from Dhul-Hulaifa when his Mount stood upright carrying him .