Reference for Berakhot 46:13

הכי קאמר הא מילתא תיתי לה בתורת טעמא ולא תיתי לה בק"ו דאי אתיא לה בתורת ק"ו זהו ק"ו שאין עליו תשובה:

But this is what he means to say : This question [of carrying Tefillin in a regular privy but not a chance one] thou mayest argue with a reason; but thou must not argue it by means of a fortiori deduction, for if thou usest this method of argument, it is an argument which cannot be refuted.

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