Rashi on Leviticus 11:23/רש"י על ויקרא י״א:כ״ג

1'וכל שרץ העוף וגו‎ BUT ALL PROLIFIC CREATURES AMONG FOWL etc. — This repetition of the statement already made in verse 20 is intended to teach that if it has five feet it is clean (Sifra, Shemini, Chapter 5 10).