Alma does not allow the congregation to pretend that he is speaking to some other person. Alma pointedly asks them: “Is there one among you who is not stripped of envy? … Is there one among you that doth make a mock of his brother, or that heapeth upon him persecutions?” Alma points out that that person is not prepared to stand before his or her God.
Verse 29 requires reading the first two sentences together to get the proper meaning. Were a reader to stop after only “is there one among you who is not stripped of envy?” it might appear that all were already stripped of envy, which would be a good thing. However, the second sentence makes it clear that it is the one who is not stripped of envy that is in danger.