Help finding a Talmud reference to "memory was like a bucket that held every drop [of Torah]"

It was a reference to the particular strength of this one Talmud Chacham, that he retained very drop of Torah that he learned. This was comparing him to other students. Maybe like a ranking?

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I would appreciate any help, my memory is more like a sieve than a bucket, and I can’t find it in sefaria