Sayyiduna Ibn Umar (may Allah be pleased with them both) narrates that I saw the Messenger of Allah (peace and blessings be upon him) performing a voluntary prayer on a donkey or a she-donkey, while his blessed face was towards Khaybar. Imam Abu Bakr (may Allah have mercy on him) says that this is Muhammad bin Dinar, al-Tahi al-Basri.