It was narrated from Maimunah that the Messenger of Allah (ﷺ) used to pray on a mat.
Abu Hazim bin Dinar narrated that some men came to Sahl bin Sa'd As-Sa'idi. They were wondering what kind of wood the Minbar was made of, so they asked him about that. He said:
"By Allah, I know what it is made of. I saw it the first day it was set up and the first day the Messenger of Allah (ﷺ) sat on it. The Messenger of Allah (ﷺ) sent word to so-and-so" - a woman whose name Sahl mentioned - "telling her: 'Tell your carpenter slave to make me something of wood that I can…
It was narrated that Ibn 'Umar said:
"I saw the Messenger of Allah (ﷺ) praying on a donkey, when he was heading toward Khaibar."
It was narrated from Anas bin Malik that he saw the Messenger of Allah (ﷺ) praying on a donkey while he was riding, praying toward Khaibar with the Qiblah behind him. Abu 'Abdur-Rahman (An-Nasa'i) said:
We do not know of anyone who reported anything to support what 'Amr bin Yahya said about praying on a donkey. As for the Hadith of Yahya bin Sa'eed from Anas, what is correct is that it is Mawquf. And Allah knows best. That is a saying or action of a Companion of the Prophet (ﷺ)