2 Thessalonians 2:12

so that all may be condemned who did not believe the truth but had pleasure in wickedness.

Romans 1:32

Though they know God's righteous decree that those who do such things deserve death, they not only continue to do these very things but also approve of those who practice them.

Romans 2:8

but for those who are self-seeking and do not obey the truth, but obey wickedness, there will be wrath and fury.

Mark 14:11

And when they heard it they were glad, and promised to give him money. So he sought an opportunity to betray him.

Mark 16:16

He who believes and is baptized will be saved; but he who does not believe will be condemned.

John 3:19-21

And this is the judgment, that the light has come into the world, and men loved darkness rather than light, because their deeds were evil.

John 3:36

He who believes in the Son has eternal life; he who does not obey the Son shall not see life, but the wrath of God remains on him."

Romans 8:7-8

For the mind that is set on the flesh is hostile to God; it does not submit to God's law, nor can it do so;

Romans 12:9

Let love be genuine. Hate what is evil; cling to what is good.

1 Thessalonians 5:9

For God has not destined us to wrath, but to obtain salvation through our Lord Jesus Christ,

2 Peter 2:3

And in their greed they will exploit you with false words; from long ago their condemnation has not been idle, and their destruction has not been asleep.

2 Peter 2:13-15

suffering wrong for their wrongdoing. They count it a pleasure to revel in the daytime. They are blots and blemishes, reveling in their deceptions, as they carouse with you.

3 John 1:11

Beloved, do not imitate what is evil, but what is good. The one who does good is of God; the one who does evil has not seen God.

Jude 1:4-5

For certain persons have crept in secretly, those who were long ago marked out for this condemnation, ungodly persons who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ.

Treasury of Scripture Knowledge

Summary

That they all might be damned who believed not the truth, but had pleasure in unrighteousness.

General references

Bible References

They

Mark 16:16
He who believes and is baptized will be saved; but he who does not believe will be condemned.
John 3:36
He who believes in the Son has eternal life; he who does not obey the Son shall not see life, but the wrath of God remains on him."
1 Thessalonians 5:9
For God has not destined us to wrath, but to obtain salvation through our Lord Jesus Christ,
2 Peter 2:3
And in their greed they will exploit you with false words; from long ago their condemnation has not been idle, and their destruction has not been asleep.
Jude 1:4
For certain persons have crept in secretly, those who were long ago marked out for this condemnation, ungodly persons who turn the grace of our God into licentiousness and deny our only Master and Lord, Jesus Christ.

General references

Hebrews 3:19
So we see that they were not able to enter because of unbelief.