Romans 1:21

Wherefore having known God, not as God did they honour or return thanks; but were rendered vain in their conversations, and their heart without understanding was darkened.

Jeremiah 2:5

Thus said Jehovah, What iniquity found your fathers in me that they removed far off from me, and went after vanity, and they became vain?

Ephesians 4:17-18

Therefore this I say, and testify in the Lord, that ye no more walk as also the rest of the nations, in the vanity of their mind,

2 Kings 17:15

And they will reject his laws and his covenant which he cut out with their fathers, and his testimonies which he testified in them; and they will go after vanity, and they will be vain, and after the nations which were round about them which Jehovah commanded them not to do as they.

Romans 1:19

Wherefore that known of God is manifest in them; for God manifested to them.

Revelation 14:7

Saying with a great voice, Fear God, and give glory to him; for the hour of his judgment has come: and worship ye him having made the heaven, and earth, and the sea, and the fountains of waters.

Genesis 6:5

And Jehovah will see that great the evil of man in the earth, and every formation of the thoughts of his heart only evil all the days.

Genesis 8:21

And Jehovah smelled a smell of sweetness; and Jehovah will say in his heart, I will not gather to curse the earth yet again on account of man; for the imagination of man's heart is evil from his youth: and I will not gather yet again to smite every living thing according to which I did.

Deuteronomy 28:29

And thou wert groping at noon as the blind shall grope in darkness, and thou shalt not succeed with thy ways: and thou wert only oppressed and stripped all the days, and none saving.

Psalm 50:23

He sacrificing praise shall honor me, and he setting the way I will cause him to look upon the salvation of God.

Psalm 81:12

And I will send him forth in the hardnesses of their heart: they shall go in their counsels.

Psalm 86:9

All the nations which thou madest shall come and worship before thee, O Jehovah, and they shall do honor to thy name.

Ecclesiastes 7:29

Only see, this I found, that God made man upright; and they sought out many purposes.

Isaiah 44:9-20

They forming a carved image all of them emptiness; and their delights shall not profit, and they are their witnesses; they will not see and they will not know, so that they shall be ashamed.

Isaiah 60:2

For behold, the darkness shall cover the earth, and gloom the nations: and Jehovah shall arise upon thee, and his glory shall be seen upon thee.

Jeremiah 10:3-8

For the laws of the peoples, this vanity: for they cut down a tree out of the forest, the work of the hands of the workman with the axe.

Jeremiah 10:14-15

Every man was brutish from knowledge: every founder was ashamed from his carved image; for his molten image a falsehood, and no spirit in them.

Jeremiah 16:19

O Jehovah, my strength and my fortress, and my refuge in days of straits, to thee shall the nations come from the ends of the earth, and they shall say, Surely our fathers inherited falsehood, vanity, and no receiving profit in them.

Hosea 2:8

And she knew not that I gave to her grain, and new wine, and new oil. and I multiplied silver to her, and gold they made for Baal.

Habakkuk 1:15-16

And he brought up a completion with the book, he will drag him in his net, and he will gather him in his fishnet: for this he will rejoice and be glad.

Luke 17:15-18

And one of them, having seen that he was healed, turned back, with a great voice honouring God.

John 3:19

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

Romans 1:28

And as they chose not to have God in knowledge, God delivered them to an adulterated purpose, to do things not fitting;

Romans 11:10

Let their eyes be darkened not to see, and let them bend their back always.

Romans 15:9

And the nations to glorify God for mercies; as has been written, For this will I acknowledge to thee in the nations; and I will play on, the harp to thy name.

2 Timothy 3:2

For men shall be self-lovers, lovers of money, boastful, proud, slandering, disobedient to parents, unthankful, wicked,

1 Peter 1:18

Knowing that not with corruptible things, silver and gold, were ye redeemed from your vain mode of life transmitted from your fathers

1 Peter 2:9

And ye a chosen race, a royal priesthood, a holy nation, a people for acquisition; so that ye should proclaim the excellencies of him having called you out of darkness into his wonderful light:

Revelation 15:4

Who shall not fear thee, O Lord, and glorify thy name? for thou alone holy: for all nations shall come and worship before thee; for thy justices were made manifest.

Acts 26:18

To open their eyes, to turn them back from darkness to light, and from the power of Satan to God, fur them to receive remission of sins, and inheritance with the consecrated by faith in me.

Treasury of Scripture Knowledge

Summary

Because that, when they knew God, they glorified him not as God, neither were thankful; but became vain in their imaginations, and their foolish heart was darkened.

Bible References

When

Romans 1:19
Wherefore that known of God is manifest in them; for God manifested to them.
John 3:19
And this is the judgment, that light has come into the world, and men rather loved darkness than light, for their works were evil.

They glorified

Romans 15:9
And the nations to glorify God for mercies; as has been written, For this will I acknowledge to thee in the nations; and I will play on, the harp to thy name.
Psalm 50:23
He sacrificing praise shall honor me, and he setting the way I will cause him to look upon the salvation of God.
Psalm 86:9
All the nations which thou madest shall come and worship before thee, O Jehovah, and they shall do honor to thy name.
Hosea 2:8
And she knew not that I gave to her grain, and new wine, and new oil. and I multiplied silver to her, and gold they made for Baal.
Habakkuk 1:15
And he brought up a completion with the book, he will drag him in his net, and he will gather him in his fishnet: for this he will rejoice and be glad.
Luke 17:15
And one of them, having seen that he was healed, turned back, with a great voice honouring God.
2 Timothy 3:2
For men shall be self-lovers, lovers of money, boastful, proud, slandering, disobedient to parents, unthankful, wicked,
Revelation 14:7
Saying with a great voice, Fear God, and give glory to him; for the hour of his judgment has come: and worship ye him having made the heaven, and earth, and the sea, and the fountains of waters.
Revelation 15:4
Who shall not fear thee, O Lord, and glorify thy name? for thou alone holy: for all nations shall come and worship before thee; for thy justices were made manifest.

But became

Genesis 6:5
And Jehovah will see that great the evil of man in the earth, and every formation of the thoughts of his heart only evil all the days.
Genesis 8:21
And Jehovah smelled a smell of sweetness; and Jehovah will say in his heart, I will not gather to curse the earth yet again on account of man; for the imagination of man's heart is evil from his youth: and I will not gather yet again to smite every living thing according to which I did.
2 Kings 17:15
And they will reject his laws and his covenant which he cut out with their fathers, and his testimonies which he testified in them; and they will go after vanity, and they will be vain, and after the nations which were round about them which Jehovah commanded them not to do as they.
Psalm 81:12
And I will send him forth in the hardnesses of their heart: they shall go in their counsels.
Ecclesiastes 7:29
Only see, this I found, that God made man upright; and they sought out many purposes.
Isaiah 44:9
They forming a carved image all of them emptiness; and their delights shall not profit, and they are their witnesses; they will not see and they will not know, so that they shall be ashamed.
Jeremiah 2:5
Thus said Jehovah, What iniquity found your fathers in me that they removed far off from me, and went after vanity, and they became vain?
Jeremiah 10:3
For the laws of the peoples, this vanity: for they cut down a tree out of the forest, the work of the hands of the workman with the axe.
Jeremiah 16:19
O Jehovah, my strength and my fortress, and my refuge in days of straits, to thee shall the nations come from the ends of the earth, and they shall say, Surely our fathers inherited falsehood, vanity, and no receiving profit in them.
Ephesians 4:17
Therefore this I say, and testify in the Lord, that ye no more walk as also the rest of the nations, in the vanity of their mind,
1 Peter 1:18
Knowing that not with corruptible things, silver and gold, were ye redeemed from your vain mode of life transmitted from your fathers

Their foolish

Romans 11:10
Let their eyes be darkened not to see, and let them bend their back always.
Deuteronomy 28:29
And thou wert groping at noon as the blind shall grope in darkness, and thou shalt not succeed with thy ways: and thou wert only oppressed and stripped all the days, and none saving.
Isaiah 60:2
For behold, the darkness shall cover the earth, and gloom the nations: and Jehovah shall arise upon thee, and his glory shall be seen upon thee.
Acts 26:18
To open their eyes, to turn them back from darkness to light, and from the power of Satan to God, fur them to receive remission of sins, and inheritance with the consecrated by faith in me.
1 Peter 2:9
And ye a chosen race, a royal priesthood, a holy nation, a people for acquisition; so that ye should proclaim the excellencies of him having called you out of darkness into his wonderful light:

General references

Psalm 94:11
Jehovah knew the thoughts of man that they are vanity.
Isaiah 40:21
Will ye not know? will ye not hear? was it not announced to you from the beginning? did ye not understand from the foundations of the earth?
Jeremiah 33:18
And to the priests, the Levites, I will not cut off a man from my face bringing up burnt-offerings, and burning the gift, and doing sacrifice all the days.
James 4:17
Therefore to him knowing to do good, and not doing, to him it is sin.