Keritot 21A

אוציא דם שרצים ⁠– שאין בהם טומאה חמורה. אוציא דם ביצים ⁠– שאין מין בשר, דם דגים דם חגבים ⁠– שכולו היתר.

I will likewise exclude the blood of creeping animals, which do not have a severe form of ritual impurity. Impurity transmitted to a person by the carcass of a creeping animal does not render clothing impure, whereas impurity transmitted by the carcass of an animal or bird does render one’s clothing impure. I will also exclude the blood of eggs, as they are not a type of meat, and finally I will exclude the blood of fish and the blood of grasshoppers, as they are entirely permitted, as explained on 21b.

״לעוף ולבהמה״? אי מה עוף שאין בה כלאים, אף בהמה ⁠– שאין בה כלאים! תלמוד לומר: ״ולבהמה״.

The baraita continues: The verse states: “And you should consume no manner of blood, whether it is of bird or of animal, in any of your dwellings” (Leviticus 7:26). The verse mentions both “bird” and “animal,” because if the verse had stated only “bird,” one might have said that just as a bird is a creature concerning which the prohibition of diverse kinds does not apply, as will be explained, so too, the prohibition against consuming blood applies only to an animal concerning which the prohibition of diverse kinds does not apply, whereas the blood of other animals is not forbidden. Therefore, the verse states: “Or of animal.”

אי מה בהמה שאינה באם על הבנים, אף עוף שאינו באם על הבנים! תלמוד לומר: ״לעוף ולבהמה״.

And if the verse had mentioned only “animal,” one might have said that just as an animal is not included in the prohibition against taking the mother bird with her young (see Deuteronomy 22:6–7), so too, a bird whose blood is forbidden is that which is not included in the prohibition against taking the mother bird with the young, i.e., non-kosher birds, whereas the blood of kosher birds is permitted. Therefore, the verse states: “Whether it is of bird or of animal.”