Reference for Rosh Hashanah 56:5

לא לשמוע לשמוע והא שמע סבור חמור בעלמא הוא

Come and hear: 'IF HE WAS PASSING BEHIND THE SYNAGOGUE, OR IF HIS HOUSE WAS ADJOINING THE SYNAGOGUE, AND HE HEARD THE SOUND OF THE SHOFAR OR OF THE READING OF THE MEGILLAH, IF HE PUT HIS MIND TO IT HE THEREBY PERFORMED HIS RELIGIOUS DUTY, BUT IF NOT HE DID NOT PERFORM HIS RELIGIOUS DUTY'. Does not this mean, 'if he put his mind to perform his religious duty'? - No; [it means, if he put his mind] to hear.

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