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

1ושקץ יהיו AND THEY SHALL BE AN ABOMINABLE THING — This statement is here repeated to prohibit all things with which it (the שרץ) is mixed if they contain so much of the שרץ as to impart its taste to them (Sifra, Shemini, Section 3 9).

2מבשרם OF THEIR FLESH — One is,however, not prohibited in respect to the fins and the bones (Sifra, Shemini, Section 3 10).

3ואת נבלתם תשקצו BUT YE SHALL HAVE THEIR CARRION IN ABOMINATION — This serves to include in the category of abominable things יבחושין found in liquids which one has filtered. יבחושין are moucherons in O. F., (English = gnats).