TT #92 · Parshas Shemini · Aliyah 5 · Passuk 2
Chabad.org — Vayikra Chapter 11 with Rashi
English: “Which is upon the earth”: this excludes creatures of the sea.
Sifra (Toras Kohanim), Shemini, Section 2.
Sefaria — Sifra, Shemini, Section 2
אֲשֶׁר עַל הָאָרֶץ. לְהוֹצִיא אֶת שֶׁבַּיָּם.
Textual exclusion — The Chazal derives the teaching from the wording or classification in the verse.
The phrase אשר על הארץ excludes aquatic creatures from the land-animal classification established by this verse.