(Click here for a much shorter version of the argument.) For those who want to keep track of the Muslim sources related to this issue, here they are. Note also: I typed these in by hand, so let me know if you spot any typos.) I.
QUR'AN TRANSLATIONS Qur’an -46—And if he (Muhammad) had forged a false saying concerning Us We surely should have seized him by his right hand (or with power and might), and then certainly should have cut off his life artery (Aorta).
He then said: Lift your hands (from eating), for it has informed me that it is poisoned. The Apostle of Allah then ordered regarding her and she was killed. 124—The Messenger of God said during the illness from which he died—the mother of Bishr b.
Thereupon he said: Allah will never give you the power to do it.I do not think about the illness of my son except the poisoned sheep of which he had eaten with you at Khaibar. When she learned that it was the shoulder she put a lot of poison in it and poisoned the whole lamb. He took hold of the shoulder and chewed a morsel of it, but he did not swallow it. I said to myself, If he is a king I shall ease myself of him and if he is a prophet he will be informed (of what I have done).’ So the apostle let her off. 251-252—When the Apostle of Allah, may Allah bless him, conquered Khaybar and he had peace of mind, Zaynab Bint al-Harith, the brother of Marhab, who was the spouse of Sallam Ibn Mishkam, inquired: Which part of the goat is liked by Muhammad? Then she slaughtered one from her goats and roasted it (the meat). The Jews discussed about poisons and became united on one poison. The Prophet, may Allah bless him, ordered it to be taken.The Prophet said: And I do not think about my illness except that. Sunan Ibn Majah 1622—Aishah said: “I never saw anyone suffer more pain than the Messenger of Allah.” IV. She poisoned the she-goat putting more poison on the forelegs, and shoulder. It was served to him and to his Companions who were present and among those who were present was Bishr Ibn al-Bara Ibn Ma’rur.(Dawood) Qur’an -46—And if he had fabricated against Us some of the sayings, We would certainly have seized him by the right hand, then We would certainly have cut off his aorta. MUSLIM COMMENTARIES Tafsir Ibn Abbas on Qur’an -46—(And if he had invented) and had Muhammad invented (false sayings concerning Us) lies against Us and attributed to Us that which We did not say, (We assuredly had taken him) We assuredly had taken revenge against him (by the right hand) by means of truth and proofs; it is also said this means: We assuredly had vehemently taken him.(And then severed his life artery) the life artery of Muhammad (pbuh).