Abu Sa'id al-Khudri reported that he went to the Messenger of Allah ﷺ and found him observing prayer on a mat and prostrating on that.
أَنَّهُ دَخَلَ عَلَى رَسُولِ اللَّهِ ﷺ فَوَجَدَهُ يُصَلِّي عَلَى حَصِيرٍ يَسْجُدُ عَلَيْهِ
I visited the Apostle ﷺ and saw him praying on a reed mat on which he was prostrating himself. And I saw him praying in a single garment with ends crossed with each other.
أَنَّهُ دَخَلَ عَلَى النَّبِيِّ ﷺ قَالَ فَرَأَيْتُهُ يُصَلِّي عَلَى حَصِيرٍ يَسْجُدُ عَلَيْهِ قَالَ وَرَأَيْتُهُ يُصَلِّي فِي ثَوْبٍ وَاحِدٍ مُتَوَشِّحًا بِهِ
[Machine] I entered upon the Messenger of Allah ﷺ while he was praying on a mat and prostrating on it.
دَخَلْتُ عَلَى رَسُولِ اللهِ ﷺ وَهُوَ يُصَلِّي عَلَى حَصِيرٍ وَيَسْجُدُ عَلَيْهِ
ذِكْرُ الْإِبَاحَةِ لِلْمَرْءِ أَنْ يُصَلِّيَ الصَّلَاةَ عَلَى الْحَصِيرِ
[Machine] "He entered upon the Prophet ﷺ and saw him praying on a mat, prostrating on it."
«أَنَّهُ دَخَلَ عَلَى النَّبِيِّ ﷺ فَرَآهُ يُصَلِّي عَلَى حَصِيرٍ يَسْجُدُ عَلَيْهِ»