Ali [rta] Is Door To Knowledge

I am in a process of learning and I would like to consult you in this context. Following is a piece of Hadith, I would appreciate it if you would send me the complete Hadith with reference, along with the authenticity of the Hadith. I heard that three caliphs are also included in some versions of this Hadith.

أنا مدينة العلم، وعلى بابها

I am the city of knowledge and Ali is its door.

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