Al-Zīyārah al-Jāmiʿa al-Kabīra (Arabic: زیارة الجامعة الکبیرة) is among the most important and most perfect ziyarah texts for the Infallible Imams (a). This ziyarah was issued by Imam al-Hadi (a) to one of his companion upon his request. The content of this ziyarah text includes Shi'a beliefs on imamate, Imams' (a) positions and Shi'a's duties about them. Al-Ziyarah al-Jami'a al-Kabira can be regarded as a course on knowing Imams (a) composed in the form of eloquent and beautiful phrases.
Al-Ziyarah al-Jami'a al-Kabira is in fact a long and eloquent description of different perspectives of the concept of imamate which Shi'a believes that survival of religion depends on believing and adhering to this principle. Due to its content referring to Imams' (a) positions, Imam al-Hadi (a) said that the pilgrim should say "Allah Akbar" 100 times before reciting this ziyarah so that he does not fall into exaggeration about Imams (a).[12]

In this ziyarah, Ahl al-Bayt (a) have been described as the rightful successors of the prophet (s) and all Shi'a teachings are explained in a clear language, including the connection between Imams (a) and the Holy Prophet (s), mentioning scholarly, moral, and political merits of Imams (a), their example, the relation between imamate and Oneness of God, the relation between knowing Imams (a) and knowing God, infallibility of the Ahl al-Bayt (a), oneness of their creation, tawalli [friendship], tabarri [rejection], raj'a [second coming] and taslim [surrender]. In this ziyarah, merits of Imams (a) are mentioned in connection with the Qur'an and the conduct of the Prophet (s) in the best way possible.