Numbers 32:10

And the LORD said unto Moses, How long will this people provoke me? and how long will it be ere they believe me, for all the signs which I have showed among them?

And the LORD heard the voice of your words, and was wroth, and sware, saying, Surely there shall not one of these men of this evil generation see that good land, which I sware to give unto your fathers. Save Caleb the son of Jephunneh; he shall see it, and to him will I give the land that he hath trodden upon, and to his children, because he hath wholly followed the LORD. Also the LORD was angry with me for your sakes, saying, Thou also shalt not go in thither. But Joshua the son of Nun, which standeth before thee, he shall go in thither: encourage him: for he shall cause Israel to inherit it. Moreover your little ones, which ye said should be a prey, and your children, which in that day had no knowledge between good and evil, they shall go in thither, and unto them will I give it, and they shall possess it. But as for you, turn you, and take your journey into the wilderness by the way of the Red sea.

Unto whom I sware in my wrath that they should not enter into my rest.

Yet also I lifted up my hand unto them in the wilderness, that I would not bring them into the land which I had given them, flowing with milk and honey, which is the glory of all lands;

Harden not your hearts, as in the provocation, in the day of temptation in the wilderness: When your fathers tempted me, proved me, and saw my works forty years. Wherefore I was grieved with that generation, and said, They do alway err in their heart; and they have not known my ways. So I sware in my wrath, They shall not enter into my rest.) Take heed, brethren, lest there be in any of you an evil heart of unbelief, in departing from the living God. But exhort one another daily, while it is called To day; lest any of you be hardened through the deceitfulness of sin. For we are made partakers of Christ, if we hold the beginning of our confidence stedfast unto the end; While it is said, To day if ye will hear his voice, harden not your hearts, as in the provocation. For some, when they had heard, did provoke: howbeit not all that came out of Egypt by Moses. But with whom was he grieved forty years? was it not with them that had sinned, whose carcases fell in the wilderness? And to whom sware he that they should not enter into his rest, but to them that believed not? So we see that they could not enter in because of unbelief.