ToT has a point. I think he is addressing it in another thread also. But the fact remains that when the writer of Hebrews spoke of this 'assembly' he was doing so about beleivers gathering with other believers.
That is not what we see in the "modern" church today. What we see is a mix of believers and non-believers gathering together. We do this in the name of "love", but what it has done is weaken our faith. There are so many levels of what this has done to the church, but the point to address in this thread is that it takes away from true unity in Christ.
It is a FACT that when you intermix non-believers with believers there is going to be confusion and division, and as much as everyone wants to point the finger at one 'issue' or another, the fact is that the gatherings are not centered on Christ. It cannot be. You cannot have people who do not believe in Christ as their Lord and Savior and have 'oneness'.
This is not how it was back then. In the first century the churches were made up of only believers. Sure, there were ones who came and listened, but when they gathered they all knew each other intimately and were able to use their gifts as the Lord [The head of the Body] led them to do. The 'watchers' did not participate.
And what happed when there were some who posed as believers, but had not truly given themselves over to Christ? They were called out, and they were put out.
The 'gathering' of believers together was a whole lot different back then. It still happens today, but it should not be associated with the usual "church service". That is not what the writer of Hebrews was speaking of.
The specific purpose of gathering together was to uplift and encourage one another in the new life in Christ. What did that look like for them back then? A WHOLE lot different than it is touted in todays "churches".
Hbr 10:24-29 And let us consider how to stir up one another to love and good works, not neglecting to meet together, as is the habit of some, but encouraging one another, and all the more as you see the Day drawing near.
For if we go on sinning deliberately after receiving the knowledge of the truth, there no longer remains a sacrifice for sins, but a fearful expectation of judgment, and a fury of fire that will consume the adversaries.
Anyone who has set aside the law of Moses dies without mercy on the evidence of two or three witnesses. How much worse punishment, do you think, will be deserved by the one who has spurned the Son of God, and has profaned the blood of the covenant by which he was sanctified, and has outraged the Spirit of grace?
The "for" that follows the admonishment to not neglect the meeting specifies why not to neglect the meeting. Why all the more as you see the day drawing near? Because they knew it would get increasingly difficult to live righteously before God. They knew that the closer we come to the return, the more wickedness would increase. The meeting was specific to 'build' each other up in the paths of righteousness. A far cry from what church meetings are about today.