Khattimin Nabiyyeen - Seal (or Last) of the Prophets
Any claimants to prophethood after the departure of Prophet Muhammad ﷺ are clearly rejected by Islam. The prophetic hadith refers to such individuals as liars and false prophets. The process of revelation initiated with Adam (alaihi salaam) has come to its completion with the arrival of final messenger of Allah ﷻ and at the beginning of the Quran this has been clearly mentioned as a defining characteristic of a believer’s faith: “who believe in what has been revealed to you, [O Muhammad], and what was revealed before you, and of the Hereafter they are certain [in faith].” The Quran never mentions anything without a reason, please note the sequence in the wording “what has been revealed to you, [O Muhammad], and what was revealed before you”, which teaches us that we are supposed to believe in what was sent before us, which comprises of revelations sent to prophets before Prophet Muhammad ﷺ, and also in what was sent to him. The Quran is silent about any revelations after Prophet Muhammad ﷺ. Had there been anything after him the same verse would have clearly mentioned wordings such as “AND what was sent after you [Muhammad]”, but nothing of this sort is mentioned in the entire Quran.
Therefore, we believe in what is revealed to Prophet Muhammad ﷺ and what was revealed before him but anything or anyone claiming to receive after him will never be accepted because Quran is the final revelation for humankind before Day of Judgment. The fact that there is no revelation after Quran is further corroborated in another verse of Quran which refers to Prophet Muhammad ﷺ as Khattimin Nabiyyeen generally translated by scholars as "Seal of the Prophets" or "Last of the Prophets" as in the following words: “Muhammad is not the father of any of your men, but he is the Messenger of Allah and the seal (or last) of the Prophets (Khattimin Nabiyyeen). Allah has full knowledge of everything.” The seal refers to completion in the process of revelation which started with Prophet Adam (a.s) and completed with the arrival of final messenger of Allah, Muhammad ﷺ. There is not going to be new revelation nor any new prophet or a messenger afterwards and this has been finalized. Unfortunately, it is also a fact that many claimants to prophethood have emerged among Muslims and non-Muslim communities in the past several centuries. According to Islam, such individuals are considered as false prophets and, in fact, we had already been warned by the Prophet ﷺ about the emergence of such pseudo prophets: “What I fear most for my nation is misguiding leaders. Some tribes among my nation will worship idols and some tribes among my nation will join the idolaters. There will be among my Ummah (nation) thirty great liars each of them asserting that he is (Allah's) prophet, where as I am the seal of the Prophets after whom (me) there will be no prophet ; and a section of my people will continue to hold to the truth and will not be injured by those who oppose them, till Allah's command comes (Day of Judgment).”
 Al Quran 2:03
 Al Quran 33:40
 Sunan Ibn Majah 3952