Hebrews 7:21

For those priests were made [ο ι μ ε ν γ α ρ - ε ι σ ι ν ι ε ρ ε ι ς γ ε γ ο ν ο τ ε ς]. Rend. for they have been made priests. Lit. are priests, having become such.

Without an oath. Without the taking of an oath by God. Scripture says nothing of an oath of God when he appointed Aaron and his posterity to the priesthood.

But this with an oath [ο δ ε μ ε τ α ο ρ κ ω μ ο σ ι α ς]. Rend. but he with the taking of an oath. The taking of the oath accompanied [μ ε τ α] the inauguration into the priesthood.

That said [λ ε γ ο ν τ ο ς]. Better, saith. Still says, since the promise is realized in Christ's priesthood.