The Prophet ﷺ used to pray on a small prayer mat.
إن النبي ﷺ كان يصلي على الخمرة.
No references are available.
Abu Yaala narrated it (6848, verified by al-Athari) from Abbas bin Walid, who said, Wahib narrated to us, from Khalid, from Abu Qilaba, from Zaynab bint Umm Salama, from her mother Umm Salama, and she related the hadith.Haythami said in Majma (2/57), "Abu Yaala narrated it, and its narrators are the narrators of sahih. Tabarani narrated it in al-Kabir and al-Awsat, except that in his version he said, 'The Messenger of Allah ﷺ had a mat and a small prayer mat on which he would pray.'"