Reference for Bekhorot 49:10

ורב חייא בר אבין מתני בלא גברי רב אמר

and the reason why it is permitted on a festival day is because it is detaching a thing from its place of growth in an unusual manner.<span class="x" onmousemove="('comment',' For it is not usual to tear or pluck wool, except to shear it.');">⁷</span>

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