(Devarim 14;6) "And every beast that has split hooves, entirely cloven in two, and which chews the cud in beast, it shall you eat": Unless it has these three signs, it may not be eaten. Abba Channan says in the name of R. Eliezer: The shesuah is a beast in itself; it has two backs and two spines. R. Yashiah said: Wherever " tzippor " is written, a clean bird is intended. R. Yitzchak said: A clean bird is called either " of " or " tzippor "; an unclean bird is called only " of ."
Sifrei Devarim 98
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