و قال عز و جل...
And the matter of Imamate is from the Completion of the Religion. و لم يمض رسول الله (صلى الله عليه و آله) حتى بين لامته معالم دينهم، و أوضح لهم سبيلهم، و تركهم على قصد سبيل الحق، و أقام لهم عليا (عليه السلام) علما و إماما، و ما ترك شيئا تحتاج إليه الامة إلا بينه، فمن زعم أن الله عز و جل لم يكمل دينه فقد رد كتاب الله، و من رد كتاب الله فهو كافر به And Rasool-Allah -saww did not leave (this world) until he -saww had explained to his -saww community, then the matters of their Religion, and clarified for them their way, and left them facing the Way of the Truth.
And he -saww nominated for them Ali -asws as a flag and an Imam -asws . And he -saww did not leave anything out which the community would need from him -saww except that he -saww explained it. So the one who claims that Allah -azwj Mighty and Majestic did not Complete His -azwj Religion, so he has rejected the Book of Allah -azwj , and the one who rejects the Book of Allah -azwj so he is a Kafir with it’.