nullifiers of one's belief that result in
apostasy are called the "Nawaaqidh"
The Naaqidh (the singular of Nawaaqidh)
can be; by statement, by action, by
belief, or by doubt. A person can
disbelieve; by a statement that he makes,
by an action that he does, by a belief
that he holds to, or by a doubt that he is
having. All four of these four issues
contain the nullifier; which can threaten
one's belief and corrupt it.