Why did Jem not want Scout to tell Atticus about Bob Ewell's comment? Was this a wise thing to ask her to do? This answer will be found in chapter 25.

The fact
thatdoesn't wantto tellis evidence of him maturing which is a theme of the novel.  Jem is older
now and sees things from a different perspective.  He wants to protect Atticus and he takes on a
protector role telling Scout that Bob Ewell is just 'hot gas' and won't do anything.  I would
not say it was a wise or unwise thing to ask of her.  Atticus was well aware of Bob Ewell and
his thoughts and plans - the kids not keeping his comments a secret would not have changed
anything.