The Ahādīth covering the topic of ‘Finality of Nubuwwah’, i.e., Khatm An-Nubuwwah, are Mutawātir.
This means that they have been narrated by many of the Sahābah radiyallāhu ‘anhum, the Tābi’ūn, and those after them in every age and in every generation in large numbers. Mutawātir further entails that the narrators are so many that it would be impossible for all of them to collude together to lie.
The Muslim Ummah, therefore, believes that a Mutawātir Hadīth is a manifest truth and they have firm faith in it, just as they have with the Noble Qur’ān. Moreover, the Ahādīth on Khatm An-Nubuwwah are all congruent in meaning. Hence, some reports are Mutawātir and then all the other reports of lower grading all have the same meaning. When this is the case, it can be safely concluded that all the Ahādīth establishing the Khatm An-Nubuwwah are Mutawātir.