It was narrated from Anas bin Malik that Umm Sulaim asked the Messenger of Allah ﷺ to come to her and pray in her house so that she could take (the place where he prayed) as a Musalla (prayer place). So he came to her and she went and got a reed mat and sprinkled it with water, and he prayed on it, and they prayed with him. (Using translation from Nasāʾī 737)  

أَنَّ أُمَّ سُلَيْمٍ سَأَلَتْ رَسُولَ اللهِ ﷺ أَنْ يَأْتِيَهَا فَيُصَلِّي فِي بَيْتِهَا فَتَتَّخِذَهُ مُصَلًّى فَأَتَاهَا فَعَمَدَتْ إِلَى حَصِيرٍ فَنَضَحَتْهُ بِمَاءٍ فَصَلَّى عَلَيْهِ وَصَلَّوْا مَعَهُ