Yahya ibn Sulayman Al-Mazini narrates, that Imam Kazim (a.s.) said “Allah will record seventy accepted Hajj for one who performs the Ziyarat of the grave of my son.” I asked, “Seventy Hajj?” Imam (a.s.) replied, “Yes and even seven hundred Hajj”. I asked, “Seven hundred Hajj? !!” Imam (a.s.) replied, ” Yes and even seventy thousand Hajj.” I asked , “Seventy thousand Hajj? !!!” Imam (a.s.) replied, “Yes and going to Hajj is not always accepted, but who performs his ziyarat and spends the night beside him is like one who visits Allah on His Throne.” I asked, “Like one who visits Allah on His Throne? !!!!”
Imam (a.s.) replied, “Yes, on the Judgement Day, there will be four people from the past nations and four people from the last nation on the Throne of Allah. The four from the past are Nuh, Ibraheem, Musa, and Isa (a.s.) and the four people from the last are Muhammad, Ali, Hasan, and Husain May Allah’s blessings be on them all. Then a barrier will be extended and only those who have gone to the Ziyarat of the graves of the Imams (a.s.) will sit with uSayyidIndeed, the highest in rank and closest to us who will be honored will be those who have performed the Ziyarat of my son, Ali.” (Kamil AI-Ziyarat. Eng. Chapter 101, pg.329)