It is narrated from Sayyiduna Ibn Mas'ud (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) was lying on a mat, and its marks appeared on his blessed side. When the Prophet (peace and blessings be upon him) woke up, I began to brush his side and said: O Messenger of Allah! Why do you not allow us to spread something over this mat? The Prophet (peace and blessings be upon him) said: "What have I to do with the world? My example and the example of the world is like that of a rider who stopped under a tree for a short while to take shade, then left it and went on his way."