Answer
Wa `alaykum As-Salamu waRahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
Dear questioner, we would like to thank you for the great confidence you place in us, and we implore Allah Almighty to help us serve His cause and render our work for His Sake.
In his response to your question, Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states:
As for the alleged statement that the Prophet (peace be upon him) did not die, it is heretical. It is at once repugnant to reason, revelation and Muslim consensus. Allah says: “The fact is you are going to die, and they too are going to die. Then you will, on the day of resurrection, debate in the presence of your Lord.” (Az-Zumar 39:30-31)
And the Qur’an reiterates the fact that the Prophet like all other prophets before him is a mortal and that no human being has been destined to live eternally in the material world: “But we never granted immortality to any human before you; so if you die, will others then be immortals?” (Al-Anbiya’ 21:34)
We learn from the sources that when the Prophet (peace be upon him) passed away, some of the eminent companions like `Umar ibn Al-Khattab denied the fact. And it was Abu Bakr As-Siddiq who after ascertaining the fact of his death, addressed the congregation saying: “Whoever has been worshipping Muhammad, let him know that Muhammad is dead. And whoever has been worshipping Allah, let him know that Allah is Ever-Living and will never die.” He then recited the following verse: “And Muhammad is only an apostle; all the [other] apostles have passed away before him: if, then, he dies or is slain, will you turn about on your heels? But he that turns about on his heels can in no wise harm God – whereas God will requite all who are grateful [to Him].” (Aal `Imran 3:144)
And the Prophet’s death and funeral are also well documented in the sources. The companions prayed his Janazah individually. Imam Ash-Shafi`i states: “Each one of them did pray individually without any imam. The reason is because of the high status of the Prophet (peace be upon him) they wanted to preempt any feeling of competition or rivalry…”
It is the narrative accepted by Muslims. If anyone says otherwise, he is simply hallucinating and making up things. That is why our eminent scholars warned us against getting carried away by unsubstantiated stories based on hearsay and wishful thinking.
Allah Almighty knows best.