Reference for Chullin 206:28

אמר רבי אסי אמר רבי יוחנן

The Master could have dealt with the same [half-olive's bulk], by which two results would have been established, viz. , we would have learnt from if that it [sc. what is vomited forth] was not considered as digested food, and we would also have learnt from it that [one is liable if only] the gullet had derived enjoyment from an olive's bulk'.

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