Jabir bin Abdullah Ansari, was a precious associate of the Prophet Mohammad (p.b.u.h) and shia Imams (p.b.u.h) that for his company to seven innocent Imams ( p.b.u.h) and longevity, many Hadiths of Shia and Sunni sources are expressed from him. Jaber met and approved the fifth Imam of Shia that is Imam Baqir (AS) and quotes various hadiths from Him. Sometimes Imam Baqir insists on the Jabir bin Abdullah faiths. Then sometimes people questioned from Imam about this insist and also about the authenticity of Jabir. Imam was point to this common response that Jabir bin Abdullah believes and faith in verse 85 of Qesas. The main research question is: what is the connection between the authenticity of Jabir and the content of that verse? In this study it is approve that the Jabir faith in the verse show his faith in "rijat". Because the faith in Rijat was the special exclusivity of True Shia in that historical course. Imam Baqir has related between Jabir faith in the verse and the authenticity of him. in this study has analyzed the reasons of the relation between Jabir’s faith in the verse and the authenticity of him, the position of rijat in system of shiaa thought, the importance of jabir doxy’s and its effect in establish the Legitimacy of Shia.