Human beings have been called as one nation in many different verses of the Holy Qur'an, and it has been emphasized on the importance of the unity and correlation. Also there are different traditions from the holy prophet and infallible Imams (P.B.U.H) that all of them show the important rule of the unity and cohesion among the different nations with different races. In this article, it has been preceded to the reasons of the unity from the point of view of the Holy Qur'an, tradition and Nahjolbalaqe, also it has mentioned the symbol of the unity in the Islamic society.
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