Translation: “This is the law of the guilt-offering” — for the Temple of all generations. “This” — it does not obtain on a bamah. One law for all guilt-offerings, that their blood is applied below.
In Sifra: The verse both restricts the asham to the permanent Temple and generalizes the blood-application rule to every species of asham.
Middah: Custom (halakhic generalization from “toras”).