Reference for Bekhorot 75:39

דתנן

This would indeed hold good according to the view of R'Meir<span class="x" onmousemove="('comment',' Who explains below that a physician's borer is meant in the statement referring to the size of the shrinkage in the skull. This is less than a sela', and thus there is a difference between Beth Shammai and Beth Hillel.');">²⁹</span>

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