Hebrews 8:4

Implying that Christ's priestly office is exercised in heaven, not in earth; in the power of His resurrection life, not of His earthly life. For--The oldest manuscripts read, "accordingly then." if, &c.--"if He were on earth, He would not even (so the Greek) be a priest" (compare Heb 7:13-14); therefore, certainly, He could not exercise the high priestly function in the earthly Holy of Holies. seeing that, &c.--"since there are" already, and exist now (the temple service not yet being set aside, as it was on the destruction of Jerusalem), "those (the oldest manuscripts omit 'priests') who offer the (appointed) gifts according to (the) law." Therefore, His sacerdotal "ministry" must be "in the heavens," not on earth (Heb 8:1). "If His priesthood terminated on the earth, He would not even be a priest at all" [BENGEL]. I conceive that the denial here of Christ's priesthood on earth does not extend to the sacrifice on the cross which He offered as a priest on earth; but applies only to the crowning work of His priesthood, the bringing of the blood into the Holy of Holies, which He could not have done in the earthly Holy of Holies, as not being an Aaronic priest. The place (the heavenly Holy of Holies) was as essential to the atonement being made as the oblation (the blood). The body was burnt without the gate; but the sanctification was effected by the presentation of the blood within the sanctuary by the high priest. If on earth, He would not be a priest in the sense of the law of Moses ("according to the law" is emphatic).

In this chapter the apostle pursues his former subject, the priesthood of Christ. And, I. He sums up what he had already said (Heb 8:1, Heb 8:2). II. He sets before them the necessary parts of the priestly office (Heb 8:3-5). And, III. Largely illustrates the excellency of the priesthood of Christ, by considering the excellency of that new dispensation or covenant for which Christ is the Mediator (Heb 8:6 to the end).

8:4 If he were here on earth: Under the old order Jesus would not even be a priest, as previously discussed (see 7:13-14). But Jesus is in heaven, which makes his priestly service distinct from and superior to that of the priests of the old covenant (8:5; 9:11, 24; 10:12).