Numbers 32:11

None of the people twenty years old or older, who came from Egypt, will see the land I promised Abraham, Isaac, and Jacob with an oath. This is because they did not wholeheartedly follow me.

Numbers 14:28-30

Therefore tell them: 'As I live, declares Jehovah, I solemnly swear I will do everything to you that you said I would do.

Numbers 14:24

My servant Caleb has a different attitude and has wholeheartedly followed me, I will bring him to the land he already explored. His descendants will possess it.

Numbers 26:2

Take a census of the entire congregation of Israel by households. List those who are at least twenty years old and eligible for military duty.

Numbers 26:64-65

Not a single one of the Israelites Moses and the priest Aaron had counted in the Desert of Sinai were there.

Deuteronomy 1:35

Not one man of this evil generation will see that good land, which I swore to give your fathers,

Deuteronomy 2:14-15

This was thirty-eight years after we left Kadesh-Barnea. By that time all the men who had been in the army at Kadesh-Barnea had died, just as Jehovah said they would.

Joshua 14:8-9

Nevertheless my brothers who went up with me made the heart of the people dissolve. But I wholly followed Jehovah my God.

Treasury of Scripture Knowledge

Summary

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

Bible References

Because

Numbers 14:24
My servant Caleb has a different attitude and has wholeheartedly followed me, I will bring him to the land he already explored. His descendants will possess it.
Joshua 14:8
Nevertheless my brothers who went up with me made the heart of the people dissolve. But I wholly followed Jehovah my God.