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Shiavault - a Vault of Shia Islamic Books Muawiya Mu'awiya's Poisoning of Imam Hasan (as) Abu Sulaiman rejects such narration's excuses include the following: Ansar.org states:"At those days, people were in an affliction, and their desires leading their instincts, each sect attributing bad things to other sects. If a story was told about that, then we ought not to accept it unless just and trustworthy people narrated it".
Many afflictions occurred during that time but the Ahl'ul Sunnah happily embrace narration about Abdullah bin Saba so why do they happily accept this as a fact of history? Should we reject ALL narrations during that period? A number of the grand Sunni scholars HAVE recorded this.
You can find this in the following books that we shall cite as proof, but before expanding on this let us set the scene to prove Mu'awiya's motive: Reasons behind the poisoning of Imam Hasan (as) Abu Sulaiman then seeks to use some logic as follows: Ansar.org states:"The truth is that Al-Hasan made peace with Mu'awiyah, and gave him the leadership and the allegiance.
Therefore, for what reason would Mu'awiyah poison Al-Hasan?" Mu'awiya despite gaining power saw in Imam Hasan (as) a formidable opponent. As Abu Sulaiman admits Mu'awiya wanted Yazeed to succeed him. This contradicted one of the conditions stipulated in the agreement with Imam Hasan (as) namely that in the event of Mu'awiya's death khilafath would RETURN to Hasan (as) (see Isti'ab, I, pp. 355 f. Usd al-ghaba, II, p. 14).
Mu'awiya had no intention to comply with this, to ensure the best approach would be to kill Imam Hasan (as) during his own lifetime. Renowned Egyptian academic Dr Taha Husayn in his book "'Ali wa banooh (Ali and his sons)" (translated in Urdu as Hadhrath 'Ali (ra) by Maulana 'Abdul Hameed Numani) on page 214 writes: "by poisoning Hasan, Mu'awiya and Amr bin Aas had made the way clear for making Yazeed the next khalifa".
Hadhrath 'Ali page 214 The motive was there, so was the method as was the means, and Masudi in Muruj-ud Dhahab Volume 2 page 486 and in Sirrul Awliya by S.M. Mubarak Alawi Karmani (Urdu translation by Ijaz ul Haqq Quddoosi) page 81 it is stated: "Imam Hassan (as)'s wife Ja'da bint e Ashas Kindi poisoned him on the orders of Mu'awiya".