The oppression of Imam Al-Hassan (Peace be upon him) from the plot of Saqifah to Ahura revolution..

In the seventh of the month of Safar 50 AH. Words have failed to describe the tragedy that befell on the succession of God on earth by the martyrdom of Imam Al-Hassan Al-Mujtaba (peace be upon him), poisoned by his wife Ja'dah daughter of Al-Ash'ath ibn Qays Al-Kindi after a plot of Mu'awiyah ibn Abi Sufyan, Mu’awiyah was sure that al-Ash‘ath’s daughter would help him achieve his objective and get his wish. At last he sent her the poison with the sinful one, Marwan bin al-Hakam. He commanded Marwan to make Ja’dah desire for marrying Yazid and to give her a hundred thousand dirhams. It was appropriate for this sinful woman to respond to the request of Mu’awiya. Ja’dah belonged to a bad family with a black history and was disposed by nature for responding to all material motives.
Concerning her, Imam As-Sadeq (peace be upon him) has said: “Surely al-Ash‘ath took part in shedding the blood of Imam Ali. His daughter Ja’dah poisoned Al-Hassan. And his son took part in shedding the blood of Al-Hussayn.” So she accepted to commit the crime. She took the poison from Marwan. Imam Al-Hassan (peace be upon him) was fasting during a very hot time. She served his food and put the poison into the yogurt. The Imam took a mouthful of it. When the poison reached his bowels, it destroyed them. When Imam Al-Hassan (peace be upon him) felt bitter pain, he (peace be upon him) said: “To Allah we belong and to Him is our return! Praise belongs to Allah for meeting Muhammad, the master of the Apostles, my father, the master of the guardians, my mother, the principal of the women of the world, my uncle, Ja‘far al-Tayyar, and Hamza, the master of martyrs.” Thus, his martyrdom (peace be upon him) was in Medina in the year 50 AH and he was forty-seven years old.
Mu’awiyah impatiently yearned for the news from Yathrib and waited for the postman an hour by an hour. He insisted on his governor to let him know the news about the Imam everyday. When the news of the death of the Imam reached him, he did not control himself out of delight, to the extent that he fell down in prostration. He and those with him exclaimed, “Allah is great!” in the Green Dome. When his wife Fakhita, daughter of Qurda, heard of that, she came out through a wicket of hers. She knew that her husband was happy and delighted. So she asked him: “May Allah delight you, O Commander of the faithful! What is that which has reached and made you glad?” “The death of al-Hassan!” he answered. She shed tears and said: “We belong to Allah and to Him is our return!” Then she wept and said: “The master of the Muslims and son of the messenger of Allah, may Allah bless him and his family, has died!”
Imam Al-Hussayn (peace be upon him) prepared his brother Al-Hassan for burial. Abdullah bin Abbas, Abdurrahman bin Ja‘far, Ali bin Abdullah bin Abbas, his two brothers Muhammad bin al-Hanafiyya and Abu al-Fadhl al-Abbas helped him in that. After he had prepared him for burial, he ordered him to be carried to the Mosque of the Prophet, so that the prayer might be performed over him. Many people escorted Imam Al-Hassan in a manner that the capital of the Prophet (Medina) had never witnessed.
The escorting processions headed for the Holy Shrine of the Prophet, that they might let Imam Al-Hassan renew his covenant with his grandfather and that they might bury him beside his grandfather. When the Umayyads came to know that, they gathered together and armed themselves. Selfishness and the enmity toward the Hashimites moved them to make an opposition and a riot as to burring Imam Al-Hassan alongside his grandfather. They refused to let Imam Al-Hassan to be buried beside his grandfather. They did not content with that but they threw the coffin with arrows to the extent that seventy arrows were drawn from it. The two parties intended to attack each other. When Imam Al-Hussayn (peace be upon him) saw that, he hurried to the Hashimites and said to them: “O Banu Hashim, (fear) Allah and beware of Him! Do not lose the will of my brother. Take him to (the cemetery of) al-Baqee‘. He had adjured me before Allah that if I was prevented from burying him with his grandfather, I should not dispute with anyone as to him and should bury him in the cemetery of al-Baqee‘ with his mother.”
Then he turned to the Umayyads and said to them: “By Allah, if there had been no injunction to me from al-Hasan to prevent bloodshed and that I should not shed even a drop of blood in carrying his will his, you would have known how the swords of Allah would have taken their toll from you. You have broken the agreement which was made between you and us. You have ignored the conditions which we made with you for ourselves.” The pure Imam was brought to the cemetery of al-Baqee‘ and was buried alongside his grandmother Fatima, daughter of Asad.
Peace be upon our master Aba Mohammad Al-Hassan son of Ali the day he was born, the day you were poisoned and left as oppressed martyr, and the day you will arise alive.