AN10.29:
This is the best of the convictions of outsiders, that is: ‘I might not be, and it might not be mine. I will not be, and it will not be mine.’ When someone has such a view, you can expect that they will be repulsed by continued existence, and they will not be repulsed by the cessation of continued existence.
In SN22.81 and probably elsewhere, this “I might not be, etc” is said to be the annihilationist view.
Note, it’s different from “It might not be”, mentioned for example in SN22.55, which is not about “I” (i.e. a self) who won’t be, but about impersonal cessation. (Manuscripts sometimes mix the two up.)