Hadith No: 1
Al-Tabari - Tarikh al-Tabari - Year 284 - Miscellaneous Reports
Volume: (10) - Page Number: (54)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... In this year, al-Mu'tadid Billah resolved to curse Mu'awiyah ibn Abi Sufyan from the pulpits and ordered the preparation of a book to be read to the people. However, Ubaydullah ibn Sulayman ibn Wahb feared the public's unrest and that there was no assurance against a potential upheaval, so he did not pay any attention to this statement.
- .... On the eleventh day - which was a Friday - it was announced in both mosques that the dhimma was free of anyone who gathered among the people for debate or argument, and that anyone who did so would render themselves subject to punishment. He also instructed the cupbearers and those serving water in the mosques not to show mercy on Mu'awiyah nor speak of him in a positive light.

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Reference: Taarikh al-Tabari Book 10

Hadith No: 2
Al-Tabari - Tarikh al-Tabari - Year 284 AH
Mention of the Book of al-Mu'tadid Regarding the Umayyads
Volume: (10) - Page Number: (54/55)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... And people began to talk that the book which al-Mu'tadid had ordered to be written, denouncing Mu'awiya, would be read from the pulpit after the Friday prayer. When the people completed the Friday prayer, they hurried to the enclosure to hear the reading of the book, but it was not read. It was then reported that al-Mu'tadid had commanded the book that al-Ma'mun had ordered to be written, denouncing Mu'awiya, to be produced....

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Reference: Taarikh al-Tabari Book 10

Hadith No: 3
Al-Tabari - Tarikh al-Tabari - Year 284
Mention of the Book of al-Mu'tadhid regarding the Umayyads
Volume: (10) - Page Number: (57/58)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Abu Sufyan ibn Harb and his followers among the accursed Umayyads in the Book of Allah, then accursed upon the tongue of the Messenger of Allah in several instances and various places, due to the foreknowledge of Allah regarding them, their affairs, their hypocrisy, and the disbelief of their minds. Thus, he fought, striving, and defended, struggling, and remained in opposition until overcome by the sword, and the command of Allah was exalted while they were reluctant. So, they were killed in Islam, not embracing it, and captured in disbelief, not turning away from it. Muhammad (peace be upon him and his holy progeny) and the Muslims recognized them for this, distinguishing them from those whose hearts were to be reconciled, so he accepted them. He and his son were aware of this, and it was among the things Allah cursed them with through the tongue of His Prophet (peace be upon him and his holy progeny) and sent down a Book regarding, His statement::{And the accursed tree in the Quran. We will frighten them, but it will only increase them in immense transgression} (Surah al-Isra 17:60). There is no disagreement among anyone that he intended by this the Banu Umayyah....

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Reference: Taarikh al-Tabari Book 10

Hadith No: 4
Al-Tabari - Tarikh al-Tabari - Year 284 AH
Mention of the Book of al-Mu'tadid regarding the Banu Umayyah
Volume: (10) - Page Number: (62)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... So, O people, refrain from what angers Allah and reconsider what pleases Him about you, and be content with what Allah has chosen for you. Adhere to what He has commanded you and avoid what He has forbidden you. Follow the straight path, the clear proof, the obvious ways, and the Ahl al-Bayt of mercy, whom Allah guided you through at the beginning and saved you from injustice and aggression in the end. He will lead you to tranquility, safety, and honor through their rule, and encompass you with righteousness in your religions and livelihoods during their days. And curse those whom Allah and His Messenger cursed, and part with those from whom you will not attain proximity to Allah except by parting from them. O Allah, curse Abu Sufyan ibn Harb, his son Muawiya, Yazid ibn Muawiya, Marwan ibn al-Hakam, and his sons. O Allah, curse the imams of disbelief, the leaders of misguidance, the enemies of religion, the fighters against the Messenger, the changeers of laws, the alters of the Book, and the sheders of forbidden blood.

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Reference: Taarikh al-Tabari Book 10