The Punishment of the Wicked: On Account of Their: Unbelief

Whoever believes and is baptized will be saved, but whoever does not believe will be condemned.

That is correct: They were broken off because of unbelief, but you stand by faith. Do not be arrogant, but be afraid.

And to whom did He swear that they would never enter His rest? Was it not to those who disobeyed?

So we see that it was because of their unbelief that they were unable to enter.

For we also received the good news just as they did; but the message they heard was of no value to them, since they did not share the faith of those who comprehended it.