1-109 Al-Khalil ibn Ahmad narrated that Abu Ja’far Muhammad ibn Ibrahim al-Daybali quoted on the authority of Abu Abdullah, on the authority of Sufyan, on the authority of Mujahid that
he heard al-Sha’abi narrated that he heard al-Nue’man ibn Bashir said that he had heard God’s Prophet (MGB) say, “There is a delicate organ in man’s body. If it is healthy all his body is healthy. If it gets ill, it will cause the ailment of the rest of the body. That is the heart.”