عن عبد الصمد بن بشير عن أبي عبد الله عليه السلام قال: تدرون مات النبي صلى الله عليه وآله أو قتل ان الله يقول: " أفإن مات أو قتل انقلبتم على أعقابكم " فسم قبل الموت انهما سقتاه [قبل الموت] فقلنا انهما وأبوهما شر من خلق الله

Narrated that Imam Sadiq (عليه السلام) said:

"You know the Prophet (صلى الله عليه وآله) died or was killed/murdered? Indeed Allah (عز وجل) says "So if he was to die or be killed, would you turn back on your heels [to unbelief]?" (3:144).

The Imam then said, "He was poisoned before He died, the two women (Aisha & Hafsa) poisoned Him before death."

We (narrator and his companions) then said, "Those two women and their fathers were the worst creation of Allah."

[Source: Tafseer al-Ayyashi, Vol. 1 Pg. 200 / Bihar Al Anwar Vol.22 Pg.516]

ومنها: ما روي عن الصادق، عن آبائه عليهم السلام أن الحسن عليه السلام قال لأهل بيته: إني أموت بالسم، كما مات رسول الله صلى الله عليه وآله فقالوا: ومن يفعل ذلك. قال: امرأتي جعدة بنت الأشعث بن قيس، فإن معاوية يدس إليها ويأمرها بذلك

Narrated from Imam Sadiq (as) from His Fathers (as) that Imam Hasan (as) said to His family, "Indeed I will die due to Poison similar to how the Prophet (saww) died. They said, "Who will do this?" Imam (as) said, "My wife Jo'adah bint al-Ash'as bin Qais (la), verily Muawiya (la) will order her to do this...."

[Source: al-Kharaej Wal-Jaraeh, Vol. 1, Pg. 241]

فقام على بن أبي طالب صلوات الله عليه وهو يبكي، فقال بأبي أنت وأمى يا نبى الله أتقتل ؟ قال: نعم، أهلك شهيدا بالسم، وتقتل أنت بالسيف وتخضب لحيتك من دم رأسك، ويقتل ابني الحسن بالسم، ويقتل ابني الحسين بالسيف يقتله طاغ ابن طاغ دعى ابن دعى

Then Ali bin Abi Talib (as) stood up while crying and said, "May my father and mother be sacrificed for you O' Prophet of Allah, will You also be killed? He [Prophet] replied, "Yes, I will be martyred by poison, and You will be killed by a sword and your beard will be colored with the blood from your head, and My son al-Hasan (as) will be killed by poison, and My son al-Hussain (as) will be killed with the sword, he will be killed by an oppressor son of an oppressor, adulterer son of an adulterer."

[Part of lengthy narration]

[Source: Kitab Sulaym bin Qays, Hadith no. 42]