Because all those men which have seen my glory, and my miracles, which I did in Egypt and in the wilderness, and have tempted me now these ten times, and have not hearkened to my voice;

But among these there was not a man of them whom Moses and Aaron the priest numbered, when they numbered the children of Israel in the wilderness of Sinai.

For the LORD had said of them, They shall surely die in the wilderness. And there was not left a man of them, save Caleb the son of Jephunneh, and Joshua the son of Nun.

So it came to pass, when all the men of war were consumed and dead from among the people,

But with many of them God was not well pleased: for they were overthrown in the wilderness.

But with whom was he grieved forty years? was it not with them that had sinned, whose carcases fell in the wilderness?

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