Hebrews 12:24

new--not the usual term (kaine) applied to the Christian covenant (Heb 9:15), which would mean new as different from, and superseding the old; but Greek, "nea," "recent," "lately established," having the "freshness of youth," as opposed to age. The mention of Jesus, the Perfecter of our faith (Heb 12:2), and Himself perfected through sufferings and death, in His resurrection and ascension (Heb 2:10; Heb 5:9), is naturally suggested by the mention of "the just made perfect" at their resurrection (compare Heb 7:22). Paul uses "Jesus," dwelling here on Him as the Person realized as our loving friend, not merely in His official character as the Christ. and to the blood of sprinkling--here enumerated as distinct from "Jesus." BENGEL reasonably argues as follows: His blood was entirely "poured out" of His body by the various ways in which it was shed, His bloody sweat, the crown of thorns, the scourging, the nails, and after death the spear, just as the blood was entirely poured out and extravasated from the animal sacrifices of the law. It was incorruptible (Pe1 1:18-19). No Scripture states it was again put into the Lord's body. At His ascension, as our great High Priest, He entered the heavenly holiest place "BY His own blood" (not after shedding His blood, nor with the blood in His body, but), carrying it separately from his body (compare the type, Heb 9:7, Heb 9:12, Heb 9:25; Heb 13:11).

— Jamieson-Fausset-Brown Commentary (public domain)