What particular verse was it that brought about the original post?
Was it -
For if we sin willfully after we have received the knowledge of the truth, there no longer remains a sacrifice for sins, but a certain fearful expectation of judgment, and fiery indignation which will devour the adversaries.
Hebrews 10:26-27
Is this the verse that got you to thinking...?
justpassinthrough
This verse is a continuation of thought from an earlier statement he made in Chapter 3.
The problem in those days was persecution from other Jews, who were pressuring new Jewish Christians to turn back to the law of Moses by turning away from Christ, or for Gentile Christians to keep the law of Moses in addition to faith in Christ, in order to be saved.
Since we are in the book of Hebrews, I will focus on the persecution from unsaved Jews on believing Jews, however I will give a quick look at the scenario of Jews pressuring Gentile's to keep the law of Moses to be saved.
1 And certain men came down from Judea and taught the brethren,
"Unless you are circumcised according to the custom of Moses, you cannot be saved."2 Therefore, when Paul and Barnabas had no small dissension and dispute with them, they determined that Paul and Barnabas and certain others of them should go up to Jerusalem, to the apostles and elders, about this question...
6 Now the apostles and elders came together to consider this matter.
7 And when there had been much dispute, Peter rose up and said to them: "Men and brethren, you know that a good while ago God chose among us, that by my mouth the Gentiles should hear the word of the gospel and believe.
8 So God, who knows the heart, acknowledged them by giving them the Holy Spirit, just as He did to us,
9 and made no distinction between us and them, purifying their hearts by faith.
10 Now therefore,
why do you test God by putting a yoke on the neck of the disciples which neither our fathers nor we were able to bear?
11 But we believe that through the grace of the Lord Jesus Christ we shall be saved in the same manner as they."
Acts 15:1-3,6-11
Please read all of Acts 15, to get the full story about this huge problem.Now we will look at the other issue of unbelieving Jews,
[Like Saul of Tarsus, before he was saved and became the apostle Paul] persecuting the Christian Jewsin order to turn them away from Christ and back to Judaism [man-made religion].
That's where this book of Hebrews comes in, especially starting in Chapter 3.
7 Therefore, as the Holy Spirit says: "Today, if you will hear His voice,
8 Do not harden your hearts as in the rebellion, In the day of trial in the wilderness,
9 Where your fathers tested Me, tried Me, And saw My works forty years.
10 Therefore I was angry with that generation, And said, 'They always go astray in their heart, And they have not known My ways.'
11 So I swore in My wrath, 'They shall not enter My rest.' "
12 Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God;
13 but exhort one another daily, while it is called "Today," lest any of you be hardened through the deceitfulness of sin.
14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end,
15 while it is said: "Today, if you will hear His voice, Do not harden your hearts as in the rebellion."
16 For who, having heard, rebelled? Indeed, was it not all who came out of Egypt, led by Moses?
17 Now with whom was He angry forty years? Was it not with those who sinned, whose corpses fell in the wilderness?
18 And to whom did He swear that they would not enter His rest, but to those who did not obey?
19 So we see that they could not enter in because of unbelief.
Hebrews 3:7-19
Here is the key verse's that must be understood, as the writer of the book of Hebrews conveys these powerful truths that lead us to Chapter 10:26-27
Beware, brethren,
lest there be in any of you an evil heart of unbelief in departing from the living God;
13 but exhort one another daily, while it is called "Today," lest any of you be hardened through the deceitfulness of sin.
14 For we have become partakers of Christ if we hold the beginning of our confidence steadfast to the end,
Beware, brethren,
lest there be in any of you an evil heart of unbelief in departing from the living God;
This is a reference to Jews who turned back to the law of Moses, and away from Christ, and no longer had a sacrifice for sin.
This is reiterated in Chapter 6 -
4 For it is impossible for those who were once enlightened, and have tasted the heavenly gift, and have become partakers of the Holy Spirit,
5 and have tasted the good word of God and the powers of the age to come,
6 if they fall away, to renew them again to repentance, since they crucify again for themselves the Son of God, and put Him to an open shame.
Hebrews 6:4-6
This is another reference to Apostasy, whereby someone turns away from The true and living God to serve another.
That is the context that is seen in Hebrews 10:26-27
This is not the case with you.
Have you renounced Christ?
Do you believe He paid the price for your sins?
If you do, then confess your sin to Him and Repent of it, and you will be forgiven.
Remember what He said to Peter -
21 Then Peter came to Him and said, "Lord, how often shall my brother sin against me, and I forgive him? Up to seven times?"
22 Jesus said to him, "I do not say to you, up to seven times, but up to seventy times seven.
Matthew 18:21-22
How much more shall your Heavenly Father forgive you.
justpassinthrough