Musannaf Ibn Abi Shaybah 4070 — Praying on mats

Sayyiduna Anas bin Malik (may Allah be pleased with him) said: One of my paternal uncles prepared food for the Prophet (peace and blessings be upon him) and said: "I would love you to eat in my house and to pray in it." The Prophet (peace and blessings be upon him) came to his house and saw that there was an old mat there. He ordered that a part of the mat be swept and sprinkled with water, and when it had been cleaned, the Prophet (peace and blessings be upon him) prayed on it and we prayed with him.