Mistranslation. Khatam Nabi means Seal of the Prophets, not last of them.
Hello Susan. I trust you are well.
Muhammad is not the father of any one of you men; he is Allahs Messenger and the seal of the prophets: Allah knows everything.
(Al-Ahzab: Verse 40).
In his article Muhammad - the Last Prophet Dr. Ahmad Shafatt writes:
The Arabic word for seal is khatam which by a change of vowel can also be read as khatim, meaning "that which puts the seal". Both words are derivatives of khatama, which means both to end or conclude something or to put a seal in order to indicate such an end or conclusion.
No matter how the word is supplied with vowels, which were omitted in the original Arabic script, the most reasonable way, if not the only way, to understand the verse is that Muhammad completed and closed the prophethood as a seal marks the completion and closure of a document, that is, he was the last prophet.
Comment:
The verse is open to interpretation, and therefore requires clarification from the aHadith. You have quoted one of A'ishahs in support of the claim that Muhammad was not the last of the prophets.
This Hadith - for which there is no early authority - represents a personal view of A'ishah; and as such cannot be a source of Islamic belief unless supported by a consensus among the companions of the Prophet. There is no such consensus.
Narrated Sad:
Allah's Apostle set out for Tabuk, appointing 'Ali as his deputy (in Medina). 'Ali said: "Do you want to leave me with the children and women?" The Prophet said: "Will you not be pleased that you will be to me like Aaron to Moses? But there will be no prophet after me."
(Sahih Bukhari: Volume 5, Book 59, Number 700). See also Sahih Muslim: Book 31, numbers 5913 and 5914; Musnad Ahmad Ibn Hanbal, Vol. I, Page 174; Sunan Ibn Majah, Page 12; al-Khasais (al-Nisai) Pages 15-16; and Mushkil al-Athar (al-Tahawi), Vol. 2, Page 309.
And here are the words of the Prophet (sallallahu 'alayhi wa sallam) himself:
O People, no prophet or apostle will come after me
.I leave behind me two things, the Quran and my Sunnah and if you follow these you will never go astray.
All those who listen to me shall pass on my words to others and those to others again; and may the last ones understand my words better than those who listen to me directly. Be my witness, O Allah, that I have conveyed Your message to Your people.
(Final Sermon).
You quote the following:
Say (Prophet): If the whole ocean were ink for writing the words of my Lord, it would run dry before those words were exhausted - even if We were to add another ocean to it.
(Al-Kahf: 109)
Comment:
This verse does not promise - or event hint at - the coming of a prophet after Muhammad (as you seem to imply); how could it, when the Prophet (sallallahu 'alayhi wa sallam) has made it perfectly clear that he is the last?
Have a great day.