1 Corinthians 10:5

but with many of them God was not pleased; for they were destroyed in the wilderness.

1 Corinthians 10:11

All these things happened to them as examples, and are recorded for our admonition on whom the ends of the ages have come;

Hebrews 3:19

And we see that they could not enter in because of unbelief.

Treasury of Scripture Knowledge

Summary

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.

Bible References

This evil

1 Corinthians 10:5
but with many of them God was not pleased; for they were destroyed in the wilderness.
Hebrews 3:19
And we see that they could not enter in because of unbelief.