Reference for Chullin 147:1

אין בהן אלא מצות פרוש בלבד

In such cases there is only the mere precept to keep aloof.<span class="x" onmousemove="('comment',' But there is no prohibition in the Torah even against the eating of this limb; as the foregoing verse is merely an indirect support for the Rabbinic restriction. It is obvious, therefore, that at the slaughtering the limb is not accounted as detached.');">¹</span>

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