Anas reported that his grandmother Mulaykah invited the Messenger of Allah ﷺ to a meal she had prepared, and he ate some of it. Then the Messenger of Allah ﷺ said, "Get up, and let me lead you in prayer."Anas said, "I went to a straw mat of ours that had turned black from long use and sprinkled it with water. The Messenger of Allah ﷺ stood on it, and I lined up with the orphan boy behind him, while the old woman stood behind us. He led us in two units of prayer and then departed."
دعت جدتي مليكة رسول الله ﷺ الطعام فأكل منه، ثم قال رسول الله ﷺ: قوموا فلأصلي لكم قال أنس: فقمت إلى حصير لنا قد اسود من طول ما لبس فنضحته بماء. فقام عليه رسول الله ﷺ وصففت أنا واليتيم وراءه، والعجوز من ورائنا. فصلى ركعتين ثم انصرف.
Malik narrated it in Shortening the Prayer While Traveling (31), from Ishaq bin Abdullah bin Abu Talha, from Anas bin Malik, and he related it. From Malik, Bukhari narrated it in the Book of Prayer (380), and Muslim in the Book of Mosques (658).Benefit derived from it, the permissibility of praying a voluntary prayer in congregation.