James compares a hearer of the word who doesn't act on it to a man looking into what?

Answer: A mirror

He is like a man who looks at his face in a mirror, then goes away and immediately forgets what he looks like.

“For anyone who hears the word but does not carry it out is like a man who looks at his face in a mirror, and after observing himself goes away and immediately forgets what he looks like.”— James 1:23-24 (BSB)