It is narrated from Sayyiduna Abu Sa'id Khudri (may Allah be pleased with him) that he came to the service of the Messenger of Allah (peace and blessings of Allah be upon him) while he (the Prophet) had a fever and was wrapped in a sheet. He (Abu Sa'id) placed his hand over the sheet on the Prophet (peace be upon him) and felt the heat even through the sheet. He said: O Messenger of Allah! How severe is your fever! The Messenger of Allah (peace be upon him) said:“Trials are made severe for us in this way, and the reward for us is also doubled.”He (Abu Sa'id) asked: O Messenger of Allah! Upon whom are the most severe trials sent? The Prophet (peace be upon him) said:“Upon the Prophets, then the righteous people. Among them, some are tested with such poverty that they have nothing except a single cloak, which they tear and wear. And they are tested with lice and fleas until they kill them. They are as happy with trials as you are with gifts.”