Reference for Ketubot 143:18

מאן דמתני לה אהא כ"ש אהך אבל מאן דמתני אהך אבל הא זימנין דמקרי ואכיל:

He who taught it in connection with this case [would apply it] with even greater force to the other case; But he who taught it in connection with the other case [applies it to that case only] but [not to this one, because] it might sometimes happen that he would eat.

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