Maimuna said, "Messenger of Allah ﷺ was praying while I was in my menses, sitting beside him and sometimes his clothes would touch me during his prostration." Maimuna added, "He prayed on a Khumra (a small mat sufficient just for the face and the hands while prostrating during prayers).  

كَانَ رَسُولُ اللَّهِ ﷺ يُصَلِّي وَأَنَا حِذَاءَهُ وَأَنَا حَائِضٌ وَرُبَّمَا أَصَابَنِي ثَوْبُهُ إِذَا سَجَدَ قَالَتْ وَكَانَ يُصَلِّي عَلَى الْخُمْرَةِ