What does Hebrews 10:25-26 mean?

25 Not forsaking the assembling of ourselves together, as the manner of some is; but exhorting one another: and so much the more, as ye see the day approaching. 26 For if we sin wilfully after that we have received the knowledge of the truth, there remaineth no more sacrifice for sins, (Hebrews 10:25-26 KJV)

Matthew Poole’s Commentary

Ver. 25. Helps to the performance of both the former duties, to God and fellow Christians, with their respective motives, are laid down in the following part of the chapter. The first is couched in this verse; neither slighting in thought, nor vilifying in word, nor separating, nor leaving by dissociation.  

Not forsaking: egkataleipontev imports such a desertion, as leaves destitute in deep trouble or distress, when they should be helping.  

The assembling of ourselves together: episunagwghn strictly notes an addition to this synagogue of the Jews; an accession of new members to the former church assembly, even the Gentiles, becoming Abraham’s seed by their conversion to, and confession of, the faith of Christ. This some of the Jews, from the self-conceit of their being the only people of God, disdained, and continued in a separation from them, and all communion with them. This the Spirit reproves, and adviseth not to leave the assembly thus augmented, lest in doing it they forsook God and Christ, as well as ordinances of worship and duties attending such church meetings, and promoting their salvation.  

As the manner of some is; such desertion of those assemblies in the worshipping and serving of God, was the common custom among some of these Hebrews; a usual, frequent mode of them to do it; some idolizing their own nation; others, their own selves, thinking them holier than others, Ga 2:12-14; others, that valued honours, riches, and ease more than Christ or their souls; some for fear of persecution, as foretold, Lu 8:13,14, fulfilled, Ga 6:12.  

But exhorting one another; parakalountev supposeth assembling, in opposition to the former desertion, and the duty of the assembled; and signifieth, counselling, reproving, encouraging, and comforting one another, so as they might persevere in performing the duties for which they assembled, according to Christ’s mind and will; so as to strengthen each other’s hearts and hands in the faith, and in the other duties instanced in before.  

And so much the more, as ye see the day approaching; they have so much the more reason to do it, and intend the work, as they did not conjecture, but certainly know, that the day of their own death, and particular account to be given of themselves to God; the day of God’s executing his judgments on Jerusalem, as Christ foretold, Mt 24:1-28, prophesied by Daniel before, Da 9:26,27, when the temple should be burnt, the city destroyed, and the people dispersed through the world; or, the day of the general judgment, testified by the gospel to the world, Ac 17:31: all these were every day nearer to them than other, and they believed them to approach; therefore ought they to be more exercised in denying evil and doing good, not forsaking church communion, but keeping close to Christ and his assemblies, that they might better stand together in that day.

Ver. 26.

If we sin wilfully: the severe exaction which God will take upon such as apostatize from him, is further enforcing the former duty, and is introduced by the particle for, to that end; if we by a free and spontaneous desertion of Christ, and his ordinances, without a coercion by threats and persecutions; and this after we had professedly in our judgments, wills, and affections, with faith and reverence, acknowledged a love and subjection to the true gospel doctrine of the way of bringing sinners to God by Christ our great High Priest, Joh 8:31; 14:6, which was made known to them by Christ and his apostles, and confirmed by miracles and the gifts of the Holy Ghost, so as to profess a full conviction of this truth, so as to assent and consent to it.  

After that we have received the knowledge of the truth; after all this, to renounce the profession of it, and to forsake the assemblies where it is held forth; this is the spontaneous and wilful sinning: see Heb 6:6.  

There remaineth no more sacrifice for sins: this is unpardonable by the just constitution of God in the gospel, because no sacrifice can atone God for them, without which they cannot be pardoned; and the sacrifice of Christ, which only could do it, they renounce and desert; and so this, nor any other they can bring, can procure pardon for them, so that their sins remain in guilt and power on them, and between them and God’s wrath are they like irrecoverably to be ground to perdition.