Reference for Chullin 66:32

האוכל אוכל ראשון ראשון שני שני שלישי שלישי

unclean in the third degree? - Perhaps this is the law only with regard to such uncleanness as declared by the Torah but not with regard to such uncleanness as decreed by the Rabbis.<span class="x" onmousemove="('comment',' The uncleanness attached to unwashed hands is a Rabbinic enactment. It is suggested that, being merely Rabbinic in origin, the law with regard thereto is not so rigid, and so would not render others unclean in the third degree.');">²³</span>

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