Grading of the chain: This chain is "da'if" because of the weakness of Zuhayr bin al-'Ala' and because of its "irsal", for Qatadah did not live in the time of al-Hasan bin 'Ali. However, this report is also narrated by another route, which will come below.

Historical verification: In some narrations without chains it is stated that the one who urged the daughter of al-Ash'ath (Ja'dah) to poison al-Hasan bin 'Ali was "Mu'awiyah bin Abi Sufyan", and in one narration without a chain the name is "Yazid bin Mu'awiyah". Ibn Kathir said in "al-Bidayah wa al-Nihayah" (11/ 209): "In my view this is not authentic, and its not being authentic regarding his father Mu'awiyah is all the more so."

Reference / Source: The report of Qatadah was narrated by Abu al-'Arab al-Qayrawani in "al-Mihan" (p. 141) from 'Abd al-'Aziz bin Shaybah al-Azdi, from Ahmad bin al-Miqdam, with this chain.

Reference / Source: Ibn Sa'd (6/ 387), and through his route Ibn 'Asakir (13/ 284), narrated it by way of al-Mughirah bin Miqsam, from "Umm Musa". This Umm Musa is a Tabi'iyyah, and discussion of her has passed under number (4722); her hadith possibly merits being graded hasan. She added in her narration: "He suffered from it (the poison), and for about forty days a basin would be placed under him and another taken away." Umm Musa did not mention the bribe of money.