Hadith 31-299

وَبِإِسْنادِهِ عَنْ عَلِيِ‏ عَلَيْهِ السَّلامُ قالَ: قالَ رَسُولَ اللَّهِ‏ صَلَّى اللهُ عَلَيْهِ وَآلِهِ: أَنَا مَدِينَةُ العِلْمِ وَعَلِيٌّ بابُها [فَمَن اَرادَ العِلْمَ فَليَاتِ البابَ‏] .

According to the same documentation on the authority of Ali (a.s.), God’s Prophet (S) said, “I am the city of knowledge and Ali is its portal. (Whoever wishes to gain knowledge should go through that portal.)