Jamieson, Fausset and Brown on Hebrews 9:25

25. As in He 9:24, Paul said, it was not into the typical, but the true sanctuary, that Christ is entered; so now he says, that His sacrifice needs not, as the Levitical sacrifices did, to be repeated. Construe, "Nor yet did He enter for this purpose that He may offer Himself often," that is, "present Himself in the presence of God, as the high priest does (Paul uses the present tense, as the legal service was then existing), year by year, on the day of atonement, entering the Holy of Holies.

with--literally, "in."

blood of others--not his own, as Christ did.