Reference for Keritot 41:15

אף כל דקתני לאיתויי מאי

The Master said: '[Here we have] a generalisation followed by a specification and then again by a generalisation, [in which case] all things similar to the specification are to be included; just as the instance of the specification are characterised in that they are subject both to light and to weighty uncleanness, and are [at times] forbidden and [at times] permitted, and are of the category of flesh, so all are included which are subject to light and to weighty uncleanness, etc.'

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