It is narrated from Sayyiduna Anas bin Malik (may Allah be pleased with him) that his grandmother Malikah (may Allah be pleased with her) invited the Messenger of Allah (peace and blessings be upon him) for a meal. The Prophet (peace and blessings be upon him) ate the food, then he said: "Stand up so that I may lead you in prayer." Sayyiduna Anas (may Allah be pleased with him) says: I washed a mat which had turned black due to long use. The Messenger of Allah (peace and blessings be upon him) stood on it, I and an orphan stood behind him, and my grandmother stood behind us. The Messenger of Allah (peace and blessings be upon him) led us in two rak‘ahs of prayer, then he departed.
Hadith Referenceالسنن المأثورة / باب صلاة الإمام بالواحد والاثنين / 58
Hadith Takhrijصحيح بخارى، الصلاة، باب الصلاة على الحصير، رقم : 380؛ صحیح مسلم ، المساجد ومواضع الصلاة، باب جواز الجماعة في النافلة والصلاة على الحصير، رقم : 658۔