The Messenger of Allah ﷺ delivered the sermon on the day of Eid while mounted on his riding camel.
أن رسول الله ﷺ خطب يوم العيد على راحلته.
No references are available.
Abu Yaala narrated it in Maqsad Ali (370), and Ibn Abu Shayba (2/189), and Ibn Khuzayma (1445), all of them through the route of Waki, who said, Dawud bin Qays Farraa narrated to us, from Iyad bin Abdullah bin Abu Sarh, from Abu Saeed, and he mentioned it. Its chain of transmission is sahih, and the origin of this hadith is found in the Sahihayn. See its documentation in the chapter on the prayer before the sermon.