Narrated from Sayyiduna Ka'b bin Malik (may Allah be pleased with him) that a man came to the Noble Prophet (peace and blessings be upon him). The Prophet (peace and blessings be upon him) asked him: "How long have you had a fever? It is an increase of heat between the skin and flesh." He replied: "It is such an affliction that I have never suffered from it." The Prophet (peace and blessings be upon him) said: "The example of a believer is like that of a soft, delicate, and fresh crop which is sometimes red and sometimes yellow."