And having a high priest, etc. Whatever he has previously said of the abrogation of the ancient priesthood, it behoves us now to bear in mind, for Christ could not be a priest without having the former priests divested of their office, as it was another order. He then intimates that all those things which Christ had changed at his coming ought to be relinquished; and God has set him over his whole house for this end, -- that every one who seeks a place in the Church, may submit to Christ and choose him, and no other, as his leader and ruler. [1]

Footnotes

1 - See [39]Appendix L 2.

And having an High Priest over the house of God - Over the spiritual house of God; that is, the church; compare the notes on Hebrews 3:1-6. Under the Jewish dispensation there was a great high priest, and the same is true under the Christian dispensation. This the apostle had shown at length in the previous part of the Epistle. The idea here is, that as under the former dispensation it was regarded as a privilege that the people of God might have access to the mercy-seat by means of the high priest; so it is true in a much higher sense that we may now have access to God through our greater and more glorious High Priest.

A high priest over the house of God - The house or family of God is the Christian Church, or all true believers in the Lord Jesus. Over this Church, house, or family, Christ is the High Priest - in their behalf he offers his own blood, and their prayers and praises; and as the high priest had the ordering of all things that appertained to the house and worship of God, so has Christ in the government of his Church. This government he never gave into other hands. As none can govern and preserve the world but God, so none can govern and save the Church but the Lord Jesus: He is over the house; He is its President; he instructs, protects, guides, feeds, defends, and saves the flock. Those who have such a President may well have confidence; for with him is the fountain of life, and he has all power in the heavens and in the earth.

And having an high priest over the house of God. The church of God, over which Christ is as prophet, priest, and King, and as the Son and owner of it; See Gill on Hebrews 3:6; See Gill on Hebrews 4:14. In the Greek text it is, "a great priest"; so the Messiah is called by the Targum on Zac 6:12 , "a great priest", as he is; even a great high priest, as in Hebrews 4:14, and greater than Aaron, and any of his sons.

high priest--As a different Greek term (archiereus) is used always elsewhere in this Epistle for "high priest," translate as Greek here, "A Great Priest"; one who is at once King and "Priest on His throne" (Zac 6:13); a royal Priest, and a priestly King.
house of God--the spiritual house, the Church, made up of believers, whose home is heaven, where Jesus now is (Hebrews 12:22-23). Thus, by "the house of God," over which Jesus is, heaven is included in meaning, as well as the Church, whose home it is.