Midras Ulangan 14:11: Sifrei Devarim

כָּל־צִפּ֥וֹר טְהֹרָ֖ה תֹּאכֵֽלוּ׃

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Sifrei Devarim

Abba Channan says in the name of R. Eliezer: The shesuah is a beast in itself; it has two backs and two spines.
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Sifrei Devarim

(Devarim 14:11) "Every clean bird you may eat": Because it is written (Vayikra 14:4) "And the Cohein shall command, and he shall take for the one to be cleansed (from leprosy) two birds," I might think that just as the slaughtered bird is forbidden (to be eaten), so, the sent-away bird; it is, therefore, written "Every clean bird you may eat (including the sent-away bird).
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