الفتاح
كلمة (الفتّاح) في اللغة صيغة مبالغة على وزن (فعّال) من الفعل...
An-Nu‘mān ibn Bashīr (may Allah be pleased with him) reported that the Prophet (may Allah's peace and blessings be upon him) said: "The believers, in their mutual love, compassion, and sympathy are like a single body; if one of its organs suffers, the whole body will respond to it with sleeplessness and fever."
The way the believers show mercy to one another, and communicate, and cooperate is similar to the relationship of a body with all its organs. If one organ feels pain, it will call upon the other organs to share the pain, resulting in sleeplessness and fever.