Numbers 32:12

For when they went up to the valley of Eshcol, and saw the land, they discouraged the heart of the children of Israel, that they should not go into the land which the LORD had given them.

The LORD’s anger burned in that day, and he swore, saying,

‘Surely none of the men who came up out of Egypt, from twenty years old and upward, shall see the land which I swore to Abraham, to Isaac, and to Jacob; because they have not wholly followed me,

The LORD’s anger burned against Israel, and he made them wander back and forth in the wilderness forty years, until all the generation who had done evil in the LORD’s sight was consumed.

“Behold, you have risen up in your fathers’ place, an increase of sinful men, to increase the fierce anger of the LORD toward Israel.

For if you turn away from after him, he will yet again leave them in the wilderness; and you will destroy all these people.”