Chapter: It is permissible to offer voluntary prayers in congregation, and to pray on hasir (palm-fiber mats), khumrah (small mats), cloth, and other pure things
Authentic
hadith of Sahih Muslim
Sahih Muslim 660b
Abdullah b. al-Mukhtar heard Musa b. Anas narrating on the authority of Anas b. Malik that the Messenger of Allah (ﷺ) led him, his mother or his aunt in prayer. He made me, stand on his right side and made the woman stand, behind us.
Anas ibn Mālik (may Allah be pleased with him) reported: My grandmother, Mulaykah, invited the Messenger of Allah (may Allah's peace and blessings be upon him) to come and eat some food she had prepared for him. He ate some of it and said: "Get up and I will lead you in prayer." So I got up and…
قُومُوا فَأُصَلِّيَ لَكُمْ " . قَالَ أَنَسُ بْنُ مَالِكٍ فَقُمْتُ إِلَى حَصِيرٍ لَنَا قَدِ اسْوَدَّ مِنْ طُولِ مَا لُبِسَ فَنَضَحْتُهُ بِمَاءٍ فَقَامَ عَلَيْهِ رَسُولُ اللَّهِ صلى الله عليه وسلم وَصَفَفْتُ أَنَا…
Anas ibn Mālik (may Allah be pleased with him) reported: An orphan and I prayed behind the Prophet (may Allah's peace and blessings be upon him) in our house, and my mother Umm Sulaym was standing behind us.
صَلَّيْتُ أَنَا وَيَتِيمٌ، فِي بَيْتِنَا خَلْفَ النَّبِيِّ صلى الله عليه وسلم وَأُمِّي أُمُّ سُلَيْمٍ خَلْفَنَا.