Reference for Niddah 38:34

מאי כדם המכה

A man may infer a ruling a minori ad majus on his own but he may not infer on his own one that is derived from a gezera shawah.<span class="x" onmousemove="('comment',' Which must be traditional if it is to be valid. As R. Meir drew the analogy on his own the Rabbis could well disregard it. ');">³¹</span>

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