It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that Sayyiduna Umar (may Allah be pleased with him) came to the Messenger of Allah (peace and blessings be upon him), while he (peace and blessings be upon him) was lying on a mat which had left its marks on his side. He (Umar) said: O Prophet of Allah! If you would take a softer and more comfortable bedding, it would be better. But he (peace and blessings be upon him) said: What have I to do with this world? My example and the example of this world is like that of a rider who is traveling on a hot day and takes shelter under the shade of a tree for a short time during the day, and then leaves it and moves on.