And Jehovah spoke to Moses and Aaron, Because you did not believe Me, to sanctify Me in the eyes of the children of Israel, therefore you shall not bring this assembly into the land which I have given to them.

So they rose early in the morning and went out into the wilderness of Tekoa; and as they went out, Jehoshaphat stood and said, Listen to me, O Judah and you inhabitants of Jerusalem: Trust in Jehovah your God, and you shall be established; believe His prophets, and you shall prosper.

When he is about to fill his stomach, God will cast upon him the fury of His wrath, and shall rain it upon him while he is eating.

And the head of Ephraim is Samaria, and the head of Samaria is Remaliah's son. If you will not believe, surely you shall not be established.

Thus says Jehovah, Cursed is the man who trusts in man, and makes flesh his strength, and whose heart departs from Jehovah.

For he shall be destitute in the wilderness, and shall not see when good comes. But he shall live in the parched places in the wilderness, in a salt land that is not inhabited.

And to whom did He swear that they would not enter His rest, but to those who did not obey?

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