Hebrews 10:24-26 reads, in context:
"And let us consider one another in order to stir up love and good works, not forsaking the assembling of ourselves together, as is the manner of some, but exhorting one another, and so much the more as you see the Day approaching. For if we sin willfully, after we have received the knowledge of the truth, there no longer remains a sacrifice for sins."
We can clearly see from this passage that Paul warns us not to forsake the "assembling of ourselves together," as the consequence of doing so could lead to our committing the unpardonable sin.
What is meant by, "assembling of ourselves together"?
Note the following renderings, which make the intended meaning clearer:
"You are the light of the world. A city that is set on a hill cannot be hidden."
-Matthew 5:14