[Avodah] How can R' Yochanan and Resh Lakish argue about the tradition of a Gezera Shava?

[Lisa Liel]

On 11/27/2017 12:58 AM, Micha Berger via Avodah wrote:
> If "Moavi velo Mo'avis" was darsehened first by Boaz's court, then we
> know of at least one gezeira shava -- from Amon to Moav -- that Boaz
> invoked withtout a tradition of its existence dating back from Sinai.
>
How was that a gezeira shava?

Lisa

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