Commentary for Shabbat 155:5
ושאר כל המשקין ברביעית: תנו רבנן דם וכל מיני משקין ברביעית רבי שמעון בן אלעזר אומר דם כדי לכחול בעין אחת שכן כוחלין לברקית ומאי נינהו דמא דתרנגולת ברא רשב"ג אומר דם כדי לכחול בו עין אחת שכן כוחלין ליארוד ומאי ניהו דמא דכרושתינא וסימניך גוא לגוא ברא לברא
heal [eye sickness] but dim [the eyesight], save water, which heals without dimming.<span class="x" onmousemove="('comment',' Hence this use too is common. ');"><sup>9</sup></span> AND ALL OTHER LIQUIDS, A REBI'ITH. Our Rabbis taught; As for blood, and all [other] kinds of liquids, [the standard is] a rebi'ith. R. Simeon b. Eleazar said: Blood, as much as is required for painting one eye, because a cataract [of the eye] is painted [with blood]. And which [blood] is that? The blood of a wildfowl. R. Simeon b. Gamaliel said: Blood, as much as is required for painting one eye, because a white spot in the eye is painted [with blood]. And with what is that? with the blood of bats.<span class="x" onmousemove="('comment',' The word denotes with large eyeballs — a species of bats. ');"><sup>10</sup></span>
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