Commentary for Keritot 42:29

דם שרצים לוקין עליו בכזית

Then the clause relating to those that walk on two legs would likewise refer to uncollected blood; but is such blood at all forbidden; has it not been taught: The blood found on a loaf of bread must be scraped away and the loaf may be eaten; that between the teeth may be sucked and swallowed without hesitation? - In the instance of that Baraitha [the blood] contained [fish] scales; Rab, on the other hand, who rules that it is forbidden, refers to a case where there were no [fish] scales.<span class="x" onmousemove="('comment',' I.e., the Baraitha speaks in fact of collected blood throughout. It is therefore right that the blood of man in these circumstances is forbidden. In the instance relating to the blood of fish it is permitted, because there were still scales in the blood which clearly indicated its origin, and no misunderstanding is possible.');">²⁰</span>

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