(21) An high priest.--The Greek words properly signify a great priest (comp. Hebrews 4:14), which is one of the names by which the high priest is frequently designated, both in the Hebrew (Leviticus 21, et al.), and in the LXX. It may seem strange that the writer should here make use of a new word in the place of that which has occurred so frequently. But there is strong reason for believing that the language of one of the prophecies of Zechariah (Zechariah 6:11-13) is here before his mind. In the preceding verses (Zechariah 6:12-14) he has used words which united sacerdotal and kingly imagery; and it would be remarkable if this did not lead his thought to that prophecy. On the head of Joshua, "the great priest" (Zechariah 6:11), are placed crowns of silver and gold in token of royal dignity: then follows the prediction of Him of whom Joshua was the type. "He shall build the house of the Lord: and He shall bear the glory, and shall sit and rule upon His throne; and He shall be a priest upon His throne." In the verse before us are combined several of the characteristic thoughts of that passage--the great priest, the priestly ruler, the house of God. The last-mentioned words are repeatedly used throughout the Old Testament, both in the Pentateuch and in later books, for the Tabernacle or Temple of God. In Hebrews 3:6 (to which there is a manifest allusion here) the meaning is enlarged, but only so that under "the house" is also comprised the household of God. Here the two thoughts are combined. Into the house of God we may enter; over it Jesus rules as "the great Priest." The family of God subject to His rule includes the whole community of "the people of God" in heaven and upon earth.

10:19-25 The apostle having closed the first part of the epistle, the doctrine is applied to practical purposes. As believers had an open way to the presence of God, it became them to use this privilege. The way and means by which Christians enjoy such privileges, is by the blood of Jesus, by the merit of that blood which he offered up as an atoning sacrifice. The agreement of infinite holiness with pardoning mercy, was not clearly understood till the human nature of Christ, the Son of God, was wounded and bruised for our sins. Our way to heaven is by a crucified Saviour; his death is to us the way of life, and to those who believe this, he will be precious. They must draw near to God; it would be contempt of Christ, still to keep at a distance. Their bodies were to be washed with pure water, alluding to the cleansings directed under the law: thus the use of water in baptism, was to remind Christians that their conduct should be pure and holy. While they derived comfort and grace from their reconciled Father to their own souls, they would adorn the doctrine of God their Saviour in all things. Believers are to consider how they can be of service to each other, especially stirring up each other to the more vigorous and abundant exercise of love, and the practice of good works. The communion of saints is a great help and privilege, and a means of stedfastness and perseverance. We should observe the coming of times of trial, and be thereby quickened to greater diligence. There is a trying day coming on all men, the day of our death.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 Zechariah 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.