The belief of "The finality of prophethood"-- an integral part faith (Imaan)

This belief is called "The finality of prophethood" and it is a fundamental doctrine of Islaam. The whole Muslim Ummah, from the time of the Holy Prophet sallallahu alayhi wasallam to this day, has held this belief as an integral part of its faith (Imaan). And according to the law of Islaam, a person who thinks that the prophethood has not been terminated upon the Holy Prophet sallallahu alayhi wasallam and the door of prophethood has not been sealed and closed, is an apostate, kaafir and a renegade.

The Finality of Prophethood in the Qur'aan