It is narrated from Sayyiduna Jabir bin Abdullah (may Allah be pleased with them both), he says: Fever sought permission to come to the Prophet Muhammad (peace and blessings be upon him). The Prophet (peace and blessings be upon him) said: Who is this? It said: I am Umm Miladim (Mother of Heat). The Prophet (peace and blessings be upon him) ordered that it be transferred to the people of Quba. So they were afflicted with it in such abundance that only Allah knows its extent. Those people came to the Prophet (peace and blessings be upon him) complaining about it. The Prophet (peace and blessings be upon him) said: What do you want? If you want me to pray to Allah to remove it from you, then fine; and if you want it to be a purifier for you, (then let it remain with you). They said: O Messenger of Allah! Does it purify from sins? The Prophet (peace and blessings be upon him) said: Yes. They said: Then let it remain.