English: “You may eat every clean bird” — R’ Yoshiyah says: wherever “tzippor” is written without qualification, a clean bird is intended. R’ Yitzchak says: a clean bird is called either “of” or “tzippor”; an unclean bird is called only “of.”
On the daf / in context: The terminology of the Torah distinguishes clean from unclean birds; the use of “tzippor” itself signals purity.
Type of Learning
Derash on lexical usage (Sifrei) — the word “tzippor” carries a presumption of purity.
What Is Learned
The Torah’s choice of the term “tzippor” indicates a clean bird; unclean birds are designated by other vocabulary.