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Hebrews 4:1-2
Therefore, since a promise remains of entering His rest, let us fear lest any of you seem to have come short of it. For indeed the gospel was preached to us as well as to them; but the word which they heard did not profit them, not being mixed with faith in those who heard it.
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Hebrews 3:7-12
Therefore, as the Holy Spirit says:
“ Today, if you will hear His voice,
Do not harden your hearts as in the rebellion,
In the day of trial in the wilderness,
Where your fathers tested Me, tried Me,
And saw My works forty years.
Therefore I was angry with that generation,
And said, ‘They always go astray in their heart,
And they have not known My ways.’
So I swore in My wrath,
'They shall not enter My rest.'"
Beware, brethren, lest there be in any of you an evil heart of unbelief in departing from the living God;
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Hebrews 3:15-18
while it is said: "Today, if you will hear His voice,
Do not harden your hearts as in the rebellion."
For who, having heard, rebelled? Indeed, was it not all who came out of Egypt, led by Moses? Now with whom was He angry forty years? Was it not with those who sinned, whose corpses fell in the wilderness? And to whom did He swear that they would not enter His rest, but to those who did not obey?
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Hebrews 10:38-39
Now the just shall live by faith;
But if anyone draws back,
My soul has no pleasure in him." But we are not of those who draw back to perdition, but of those who believe to the saving of the soul.
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1 Corinthians 2:14
But the natural man does not receive the things of the Spirit of God, for they are foolishness to him; nor can he know them, because they are spiritually discerned.
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Jude 1:3-5
Beloved, while I was very diligent to write to you concerning our common salvation, I found it necessary to write to you exhorting you to contend earnestly for the faith which was once for all delivered to the saints. For certain men have crept in unnoticed, who long ago were marked out for this condemnation, ungodly men, who turn the grace of our God into lewdness and deny the only Lord God and our Lord Jesus Christ. But I want to remind you, though you once knew this, that the Lord, having saved the people out of the land of Egypt, afterward destroyed those who did not believe.
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Romans 1:18-20
For the wrath of God is revealed from heaven against all ungodliness and unrighteousness of men, who suppress the truth in unrighteousness, because what may be known of God is manifest in them, for God has shown it to them. For since the creation of the world His invisible attributes are clearly seen, being understood by the things that are made, even His eternal power and Godhead, so that they are without excuse,
For more scripture references, please see Bible verses for Unbelief
Resources
Tempting God (Numbers 14)
Sermonette by James BeaubelleWe must carefully consider the offenses preventing the Israelites from entering the Land. That evil generation refused to trust Him, but complained continually.
How Can We Measure Our Faith?
CGG Weekly by Pat HigginsHow do we obey this call to test ourselves, to know whether we are in the faith? A good place to start is to see how God measures faith, beginning with Abraham.
Overcoming Troubled Hearts (Part Two)
CGG Weekly by Clyde FinkleaWe cannot allow our troubled hearts to lead us away from God and His purpose for us. Two vital elements will deliver us from destructive fear and unbelief.

Wandering the Wilderness in Faith
'Personal' from John W. RitenbaughLike the Israelites, Christians must live by faith as we follow Christ through a spiritual wilderness. Faith is the vital component carries us through.
Disbelief
CGG Weekly by David C. GrabbeCan anything be more paradoxical than professing Christians not following the words of the One they claim as their Savior? In works they deny Him.
The Christian Fight (Part Three)
'Personal' from John W. RitenbaughWith all the military metaphors in the Bible, there can be no doubt that God likens the Christian life to a war against the evils and temptations we face.
Our Faith Is the Victory
Sermon by Martin G. CollinsWhile the carnal mindset is hostile to everything in God's word, we have been provided a gift to enable us to overcome: the faith from being born of God.
The Post-Resurrection Last Words of Christ (Part Two)
Sermon by Martin G. CollinsIt is presumptuous to cast aspersions on Thomas, using the cliché 'Doubting Thomas,' as he was braver than most of us would have been in his circumstances.
For more resources, please see the library topic for Unbelief