TT #223 · Parshas Shemini · Aliyah 7 · Passuk 38
Chabad.org — Vayikra Chapter 11 with Rashi
English: “It is impure”: the rule applies even when seed is placed upon water, not only when water is placed upon seed.
Toras Kohanim.
Wikisource — Sifra, Shemini, Chapter 8
Textual inclusion — The Chazal derives the stated rule from the wording and structure of the verse.
The rule applies in either direction of seed and water contact.