“Muawiya sent word to Jo’dah bint Ash’ath, the wife of Hasan, that if she would kill her husband, he would pay her 100,000 dirhems, and would marry his son, Yazid, to her.”
Muawiya awakened in Jo’dah the ambition to become a queen, and when he sent the poison to her, as it was arranged between them, she administered it to her husband, and he died from it. Muawiya rewarded her by paying 100,000 dirhems, but backed out of his promise to marry her to Yazid by saying: “I love my son.”
Abu’l-Faraj Ispahani in his Maqatilu’t-Talibin, Ibn Abdu’l-Bar in his Isti’ab, Mas’udi in his Isbatu’l- Wasiyya, and many other ulema have reported that Asma Ju’da, by order and promise of Mu’awiya, gave poison to Abu Muhammad Hasan Ibn Ali. Ibn Abdu’l-Bar and Muhammad Bin Jarir Tabari have also reported that when Mu’awiya was informed of the demise of the Holy Imam, he shouted the takbir (Allah is Great).
This can be found in The Suffering of the Ahl ul Bayt and their Followers throughout History Chapter 16 by Mateen J. Charbonneau
Peace be on you, O son of the Messenger of the Lord of the worlds! Peace be on you, O son of the Commander of the faithfuls! Peace be on you, O son of Faatimah Zahraa!
Peace be on you, O dearest intimate of Allah! Peace be on you, O sincere friend of Allah! Peace be on you, O faithful confidant of Allah! Peace be on you, O decisive argumern of Allah! Peace be on you, O light of Allah! Peace be on you, O the “way” unto Allah! Peace be on you, O meaning and demonstration of the commands of Allah! Peace be on you, O he who rescued the religion of Allah! Peace be on you, O liberal, mild and wise sage! Peace be on you, O he who was kept out of (his) rightful office (but) carried out (his) duty! Peace be on you, O confident guardian! Peace be on you, O scholar who determined the essential feature of (Religion) ! Peace be on you, O the rightly guided guide! Peace be on you, O impeccable “man of learning “! Peace be on you, O God –fearing holy! Peace be on you, O genuine, worthy and deserving right! Peace be on you, O truthful witness who gave life in the way of Allah! Peace be on you, O Abaa Muhammad, Hasan (son of) Ali! Mercy of Allah and his blessings be on him. O Allah! Send blessings on Muhammad and on the children of Muhammad.