Hazrat Abdullah bin Mas'ud (may Allah be pleased with him) narrated that I went to the service of the Messenger of Allah (peace and blessings be upon him), and he had a severe fever. I said, "O Messenger of Allah! You have a very high fever." The Prophet (peace and blessings be upon him) said, "Yes, I experience fever as much as two men among you." I asked, "Is it because the reward for you is also doubled?" He replied, "Yes, that is the case. Whatever hardship befalls a Muslim, whether it is a thorn or something more painful, then just as a tree sheds its leaves, in the same way Allah the Exalted makes that hardship an expiation for his sins."