Reference for Shevuot 9:3

דתנא דבי ר' ישמעאל (ויקרא יא, לב) במים במים שני פעמים אין זה כלל ופרט אלא ריבה ומיעט

And the Rabbis [who disagree with Rabbi in connection with the redemption of the first-born - what is their reason]? Rabina said: They agree with the Western [Palestinian] Academies who hold that where there are two general statements followed by a particular, the particular should be regarded as being between the two general statements, and the verse may then be expounded on the principle of 'generalisations and specifications'.

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