Al-Majlisi I:
narrated through a strong, equivalent to authentic, chain from Al-Bazanti who said: we were in the presence of Al-Ridha(عليه السلام) with a large group of people, until they started talking about the Day of Al-Ghadir, until some people denied it, then Al-Ridha(عليه السلام) said: "narrated to me my father from his father (عليه السلام) who said: 'verily, the Day of Al-Ghadir is more famous in the Heavens than on Earth, verily Allah has created a palace in High Paradise, one block of it is built of silver and one block of it is built of gold, in it there are one hundred thousand domes made of red sapphire, and one hundred thousand tents made of green sapphire, its surface is musk and perfume, in it there are four rivers, one river of wine, one river of water, one river of milk and one river of honey, surrounded with all sorts of fruits, on them there are birds with bodies made of pearls and wings made of sapphire, singing colourful songs, when the Day of Al-Ghadir comes, people of the heavens enter into that palace, they praise Allah and glorify Him, they bear witness to His Oneness, then those birds fly and dive into that water, whereupon that musk and perfume wallow, then once the angels are gathered they fly away and that fragrance sprinkles over them and in that day they take away gifts from the gifts of Fatimah's marriage (عليها السلام), and at the end of that day, it is announced: "return to your positions for you are protected of error and fault until the next year on this day, as an honor for Muhammad (صلى الله عليه وآله) and Ali (عليه السلام)."'"
He (عليه السلام) then said: "O Ibn Abi Nasr, wherever you are on the Day of Al-Ghadir make sure to go there at the presence of Amirul-Mu'minin (عليه السلام), because Allah Almighty forgives the sins of seventy years of every believing man and believing woman and of every Muslim man and Muslim woman, and releases from Hellfire twice as many as in the month of Ramadhan and in the Laylatul Qadr and the Night of Fitr, and one Dirham charity to your brothers in faith in this day equals one thousand, so be generous to your brothers on this day and make every believing man and believing woman happy in this day."
He (عليه السلام) then said: "O people of Kufa, you have indeed been given abundant blessing and you are verily of those whose hearts have been tested by Allah upon faith, you are indeed left alone, subjugated, afflicted, tribulations are poured unto you incessantly, until the Resolver of the great suffering resolves it, by Allah if people really recognised the greatness of this day, the angels would have embraced them every day ten times, and if it was not that I dislike verbosity I would have mentioned about the superiority of this day details of what Allah bestows upon those who recognise the greatness of this day that could not be measured in numbers."
Ali ibn Al-Hasan ibn Fadh'dhaal said: Muhammad ibn Abdullah ibn Zurarah told me: "I indeed visited Al-Bazanti along with your father and Al-Hasan ibn Al-Jaham more than fifty times and each time we heard this narration from him."
Source: Rawdhatul Muttaqeen,Vol. 9 Pg. 301-302