It is derived from “tumaso”–“tumaso”; it is written here “for all his tumah.”
The gezeirah shavah on the word “tumaso” is the textual hook that ties this passuk’s human tumah to the established Mikdash-tumah law.
Type of Learning: Gezeirah shavah on “tumaso.”
What Is Learned: The phrase “for all his tumah” is the hook that ties this passuk’s human tumah to the established Mikdash-tumah law. The oleh ve-yored of this verse is thereby limited to the Mikdash/kodashim framework.