Sunan Abi Dawud 656
سنن أبي داود#656SahihMaimunah bint al-Harith reported :the Messenger of Allah (ﷺ) used to pray while. I was by his side in the state of menstruation. Sometime his cloth would touch me when he prostrated. He would pray on a small mat
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
Shuaib Al ArnautSahih
Zubair Ali ZaiSahih Bukhari (379) Sahih Muslim (513)
In-book reference: 2:266