I said to Ibn Umar, "I have seen you begin the talbiyah when your camel rises up beneath you."He replied, "The Messenger of Allah ﷺ used to begin the talbiyah when his camel rose up beneath him and set off."
أخبرنا محمد بن العلاء قال أنبأنا ابن إدريس عن عبيد الله وابن جريج وابن إسحق ومالك بن أنس عن المقبري
قلت لابن عمر رأيتك تهل إذا استوت بك ناقتك قال إن رسول الله ﷺ كان يهل إذا استوت به ناقته وانبعثت
No references are available.
Bukhari narrated it in Kitab al-Wudu, Bab ghusl al-rijlayn fi al-nial etc., no. 166, and Muslim in Kitab al-Hajj, Bab bayan anna al-afdal an yuhrima hina tanbaithu bihi rahilatuhu mutawajjihan ila Makkah..., no. 1187, from the hadith of Malik through this route. It is also in al-Kubra, no. 3741, and in Muwatta (Yahya), 1/333, in full.