about his death The Prophet and Apostle of Al-Mighty God Allah Subhanahu Wata'ala Prophet Muhammad bin Abdullah Sallallahhu'alaihi Wassalam die at the age of 63 years because of fever at his house in Medina (House with Saiyadatina Ummirul Mukminin Aishah binti Saidina Abu Bakar Al-Siddiq Radiallahhuanhu in the year 632 A.D.
The Prophet (peace and blessings of Allaah be upon him) was affected by the poisoned mutton that he ate in Khaybar.
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Some relevant Ahadith on the subject:
The Prophet (pbuh) forgave the Jewess who actually poisoned the sheep:
Sahih Bukhari, Volume 003, Book 047, Hadith Number 786.
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Narated By Anas bin Malik : A Jewess brought a poisoned (cooked) sheep for the Prophet who ate from it. She was brought to the Prophet and he was asked, "Shall we kill her?" He said, "No." I continued to see the effect of the poison on the palate of the mouth of Allah's Apostle.
A more general description of the event:
Sahih Bukhari, Volume 004, Book 053, Hadith Number 394.
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Narated By Abu Huraira : When Khaibar was conquered, a roasted poisoned sheep was presented to the Prophets as a gift (by the Jews). The Prophet ordered, "Let all the Jews who have been here, be assembled before me." The Jews were collected and the Prophet said (to them), "I am going to ask you a question. Will you tell the truth?'' They said, "Yes.' The Prophet asked, "Who is your father?" They replied, "So-and-so." He said, "You have told a ie; your father is so-and-so." They said, "You are right." He siad, "Will you now tell me the truth, if I ask you about something?" They replied, "Yes, O AbuAl-Qasim; and if we should tell a lie, you can realize our lie as you have done regarding our father." On that he asked, "Who are the people of the (Hell) Fire?" They said, "We shall remain in the (Hell) Fire for a short period, and after that you will replace us." The Prophet said, "You may be cursed and humiliated in it! By Allah, we shall never replace you in it.'' Then he asked, "Will you now tell me the truth if I ask you a question?" They said, "Yes, O Ab Li-AI-Qasim." He asked, "Have you poisoned this sheep?" They said, "Yes." He asked, "What made you do so?" They said, "We wanted to know if you were a liar in which case we would get rid of you, and if you are a prophet then the poison would not harm you."
And also:
Sahih Bukhari, Volume 005, Book 059, Hadith Number 713.
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Narated By Ibn Abbas : 'Umar bin Al-Khattab used to let Ibn Abbas sit beside him, so 'AbdurRahman bin 'Auf said to 'Umar, "We have sons similar to him." 'Umar replied, "(I respect him) because of his status that you know." 'Umar then asked Ibn 'Abbas about the meaning of this Holy Verse: "When comes the help of Allah and the conquest of Mecca..." (110.1)