The Messenger of Allah ﷺ used to pray on a small prayer mat.
حدثنا عفان حدثنا وهيب قال حدثنا خالد عن أبي قلابة عن بعض ولد أم سلمة
أن رسول الله ﷺ كان يصلي على الخمرة
No references are available.
Its chain of transmission is daif due to the anonymity of one of Umm Salama's children, but the hadith itself is sahih, since the narrator is named in Tabarani and Abu Yaala's versions, from Zaynab bint Umm Salama, from Umm Salama.See Tabarani's Mujam al-Kabir 23/351, number 821, and Musnad Abu Yaala 12/311, number 6884. Haythami said, 2/57, "The narrators of Abu Yaala's version are the narrators of sahih [sources]."This hadith has come up many times before. See "Hand me the prayer mat," 25962, and its cross-references.