Reference for Bekhorot 89:25

אלא

Said R'Papa: You should not say that the feet must be thin<span class="x" onmousemove="('comment',' So Rashi understands here. The Arukh says that means: The length and width of the feet are alike. Rashi in his commentary on the Mishnah appears to combine both interpretations. Tosaf. Yom Tob suggests that Rashi on the Mishnah means that they are either thin or that their length etc.');">¹³</span>

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