I saw the Prophet ﷺ addressing the people from atop his she-camel Adba on the Day of Sacrifice at Mina.
حدثنا هارون بن عبد الله حدثنا هشام بن عبد الملك حدثنا عكرمة
رأيت النبي ﷺ يخطب الناس على ناقته العضباء يوم الأضحى بمنى
[Its isnad is hasan] Ahmad narrated it, 3/485, and Nasai in Kubra, hadith no. 4095, from the hadith of Ikrima through the same chain. Ibn Khuzayma graded it sahih, hadith no. 2953, and so did Ibn Hibban, hadith no. 1016.