1 For the law, having a shadow of the good to come, not the very image of the things, can never with the same sacrifices year by year, which they offer continually, make perfect those who draw near.
For there is an annulling of a foregoing commandment because of its weakness and uselessness (for the law made nothing perfect), and a bringing in thereupon of a better hope, through which we draw near to God.
The Holy Spirit is indicating this, that the way into the Holy Place wasn't yet revealed while the first tabernacle was still standing; which is a symbol of the present age, where gifts and sacrifices are offered that are incapable, concerning the conscience, of making the worshipper perfect;
Every priest indeed stands day by day ministering and often offering the same sacrifices, which can never take away sins, but he, when he had offered one sacrifice for sins for ever, sat down on the right hand of God; from that time waiting until his enemies are made the footstool of his feet. For by one offering he has perfected forever those who are being sanctified. The Holy Spirit also testifies to us, for after saying, "This is the covenant that I will make with them: 'After those days,' says the Lord, 'I will put my laws on their heart, I will also write them on their mind;'" then he says, "I will remember their sins and their iniquities no more." Now where remission of these is, there is no more offering for sin.
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Commentary on Hebrews 10 Matthew Henry Commentary
Chapter 10
The apostle knew very well that the Hebrews, to whom he wrote, were strangely fond of the Levitical dispensation, and therefore he fills his mouth with arguments to wean them from it; and in order thereto proceeds in this chapter,
Hbr 10:1-6
Here the apostle, by the direction of the Spirit of God, sets himself to lay low the Levitical dispensation; for though it was of divine appointment, and very excellent and useful in its time and place, yet, when it was set up in competition with Christ, to whom it was only designed to lead the people, it was very proper and necessary to show the weakness and imperfection of it, which the apostle does effectually, from several arguments. As,
Hbr 10:7-18
Here the apostle raises up and exalts the Lord Jesus Christ, as high as he had laid the Levitical priesthood low. He recommends Christ to them as the true high priest, the true atoning sacrifice, the antitype of all the rest: and this he illustrates,
And now we have gone through the doctrinal part of the epistle, in which we have met with many things dark and difficult to be understood, which we must impute to the weakness and dulness of our own minds. The apostle now proceeds to apply this great doctrine, so as to influence their affections, and direct their practice, setting before them the dignities and duties of the gospel state.
Hbr 10:19-39