Numbers 14:35
"I the LORD have said, I will surely do it unto all this evil congregation, that are gathered together against me: in this wilderness they shall be consumed, and there they shall die."
Cross References (ranked by relevance)
God is not a man, that he should lie; neither the son of man, that he should repent: hath he said, and shall he not do it? or hath he spoken, and shall he not make it good?
But with many of them God was not well pleased: for they were overthrown in the wilderness.
So we see that they could not enter in because of unbelief.
For the LORD had said of them, They shall surely die in the wilderness. And there was not left a man of them, save Caleb the son of Jephunneh, and Joshua the son of Nun.
Now all these things happened unto them for ensamples: and they are written for our admonition, upon whom the ends of the world are come.