Reference for Chullin 273:44

פאה מכל אחד ואחד וחכמים אומרים

Now Beth Shammai's view is clear, for [we see that] two sheep are also referred to as zon,<span class="x" onmousemove="('comment',' , 'flock'; in the verse quoted by him in the Mishnah; Isa. VII, 21.');">³⁰</span>

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