(94) باب الصَّلاَةِ عَلَى الْحَصِيرِ
Anas b. Malik said; the prophet (ﷺ) used to visit Umm Sulaim. Sometimes the time for prayer would come and he would pray on out carpet that was really a mat. She (Umm Sulaim) used to wash it with water.
Reference: Sunan Abi Dawud 658
In-book reference: Book 2, Hadith 268
English translation: Book 2, Hadith 658