Adam Clarke's Commentary on the Bible

Verse 24 (Hebrews 9:24)

Christ is not entered into the holy places made with hands - He is not gone into the holy of holies of the tabernacle or temple, as the Jewish high priest does once in the year with the blood of the victim, to sprinkle it before the mercy-seat there; but into heaven itself, which he has thus opened to all believers, having made the propitiatory offering by which both he and those whom he represents are entitled to enter and enjoy eternal blessedness. And hence we may consider that Christ, appearing in his crucified body before the throne, is a real offering of himself to the Divine justice in behalf of man; and that there he continues in the constant act of being offered, so that every penitent and believer, coming unto God through him, find him their ever ready and available sacrifice, officiating as the High Priest of mankind in the presence of God.

- Adam Clarke's Commentary on the Bible