Numbers 32:9-13

For when they went up to the Valley of Eshcol and saw the land, they discouraged the sons of Israel so that they did not go into the land which the Lord had given them.

So the Lord’s anger burned on that day, and He swore, saying,

‘None of the men who came up from Egypt, from twenty years old and upward, shall see the land which I swore to Abraham, to Isaac, and to Jacob; for they did not follow Me fully,

except Caleb the son of Jephunneh the Kenizzite and Joshua the son of Nun; for they have followed the Lord fully.’

So the Lord’s anger burned against Israel, and He made them wander in the wilderness for forty years, until the entire generation of those who had done evil in the sight of the Lord came to an end.