For the source text click/tap here: Zevachim 50
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The Gemara on our daf examines whether rules are true in all cases where the source of the original law is not a clear biblical passage but is learned by means of some exegetical derivation. For example, can something learned from a hekesh be used to teach based on:
a gezeira shava?
a kal vaḥomer?
a binyan av?
All of these methods of analysis are among the midot she-haTorah nidreshet bahem – the hermeneutical principles established by the Sages and used to derive laws from the Torah.
Gezeira shava – is a verbal analogy. If the same word or phrase appears in two places in the Torah, we may infer on the basis of “verbal analogy” that the same law must apply in the other case, as well.
We explore the hermeneutic rules of gezeira shava.