Commentary for Sanhedrin 56:20

אמר ליה אביי ממאי דרבי יוסי דמתניתין דמכשר בגיסו דילמא רבי יוסי דברייתא דפסיל בגיסו

Another [Baraitha]has been taught: A brother-in-law himself. R. Judah said: A step-son. Whatdoes this mean? Shall we assume it to mean as follows: A step-son himself,and the same applies to a brother-in-law; whereas R. Jose reversed this:A brother-in-law himself, and the same applies to astep-son?<span class="x" onmousemove="('comment',' Thus differing, not in the application of the law, but in expression. On this hypothesis, the difference lies in which is to be regarded as fundamental and which as derivative. ');">²⁹</span>

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