Sunan Abi Dawud 658
سنن أبي داود#658SahihAnas 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
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Al-AlbaniSahih
Muhammad Muhyi Al-Din Abdul HamidSahih
Zubair Ali ZaiSahih
In-book reference: 2:268