Treasury of Scripture Knowledge
I will therefore put you in remembrance, though ye once knew this, how that the Lord, having saved the people out of the land of Egypt, afterward destroyed them that believed not.
1 Corinthians 10:1
Moreover, brothers, I would that ye not ignore how our fathers were all under the cloud and all passed through the sea
Because all those men who saw my glory and my signs which I have done in Egypt and in the wilderness and have tempted me now these ten times and have not hearkened to my voice,
And among these there was not a man of those whom Moses and Aaron the priest had numbered when they numbered the sons of Israel in the wilderness of Sinai.
For indeed the hand of the LORD was against them, to destroy them from among the camp until they were consumed.
Therefore he lifted up his hand against them, to overthrow them in the wilderness,
For some of those that came out of Egypt with Moses, when they had heard, did provoke; howbeit not all.
Let us, therefore, fear, lest a promise being left us of entering into his rest, any of you should seem to come short of it.
Yet with all this ye did not believe in the LORD your God,
Peradventure did Achan, the son of Zerah, not commit a trespass in the anathema, and wrath fell on all the congregation of Israel? And that man did not perish alone in his iniquity.
because they had not believed God, nor had they trusted in his saving health;
And five of them were prudent, and five were foolish.
1 Corinthians 10:5
But with many of them God was not pleased; therefore, they were overthrown in the wilderness.
1 Timothy 5:15
For some are already turned back after Satan.
So we see that they could not enter in because of their unbelief.