Reference for Niddah 42:6

איני והא כי אתא רב הושעיא מנהרדעא אתא ואייתי מתניתא בידיה

And should you reply that R. Judah differs only in respect of red and black but not in that of green and white [the question would arise]: For<span class="x" onmousemove="('comment',' Cf. BaH. ');">⁶</span>

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