Al-Ziyarah Al-Jamiʿa Al-Kabira is among the most important and most perfect Ziyarah texts for the Infallible Imams (AS).
This Ziyarah was issued by Imam Al-Hadi (AS) to one of his companion upon his request. The content of this Ziyarah text includes Shia beliefs on imamate, Imams’ (AS) positions and Shias duties about them. Al-Ziyarah Al-Jami’a Al-Kabira can be regarded as a course on knowing Imams (A.S) composed in the form of eloquent and beautiful phrases.
source:shafaqna