Proving the richness of Mahdavi hadiths in validating other hadiths by adapting Ghadir's sermon

The hadith of Ghadir is one of the few enduring legacies of the Prophet (PBUH) that there is no doubt about its correctness and content among all Muslim sects. The late Tabarsi has narrated a long sermon about this historical event which is not found in other sources and the document he presented to it is not free of objections and problems. In this sermon, there are about eighteen sentences about Mahdaviat and the Imam of the Age, which show the importance of this fact in the presence of the Prophet (PBUH) who has included it in the most important event in the history of Islam. According to the study, almost all of these sentences are clear and embedded in the culture and heritage of the Ahl al-Bayt, and none of them is faced with ideological ambiguity or doubt about its correctness. Therefore, the Mahdaviat part of this sermon, according to the available evidence, is fixed and inviolable and can be a strong support for the legitimacy of Ghadir sermon.