2 Thessalonians 2:11

And therefore God shall send them strong delusion, that they should believe lies:

Romans 1:28

And as it seemed not good unto them to be a known of God, even so God delivered them up unto a lewd mind, that they should do those things which were not comely,

Ezekiel 14:9

And if that Prophet be deceived, when he telleth him a word: then I the LORD myself have deceived that Prophet, and will stretch forth mine hand upon him, to root him out of my people of Israel:

1 Kings 22:18-22

Then said the king of Israel to Jehoshaphat, "Did I not tell thee, that he would prophesy no good unto me, but evil?"

2 Chronicles 18:18-22

And Micaiah answered, "Therefore hear ye the word of the LORD. I saw the LORD sit upon his seat, and all the company of heaven standing on his righthand and on his left.

Psalm 81:11-12

But my people would not hear my voice; and Israel would not obey me.

Psalm 109:17

His delight was in cursing, and therefore shall it happen unto him; he loved not blessing, therefore shall it be far from him.

Isaiah 6:9-10

And so he said, "Go, and tell this people: 'Ye shall hear indeed, but ye shall not understand; ye shall plainly see, and not perceive.

Isaiah 29:9-14

Ponder these things once in your mind, and wonder: Blinded are they themselves, and the blind guides of others; they are drunken, but not with wine; they are unstable, but not through strong drink.

Isaiah 44:20

The keeping of dust, and foolishness of heart hath turned them aside: so that none of them can have a free conscience to think, "Do not I err?"

Isaiah 66:4

Therefore will I also have pleasure in laughing them to scorn, and the thing that they fear, will I bring upon them. For when I called, no man gave answer; when I spake, they would not hear: But did wickedness before mine eyes, and chose the things that displease me.

Jeremiah 27:10

For they preach you lies, to bring you far from your land, and that I might cast you out, and destroy you.

Ezekiel 21:29

because thou hast looked thee out vanities, and prophesied lies, that it may come upon thy neck like as upon the other ungodly which be slain: whose day came, when their wickedness was full.

Matthew 24:5

For many shall come in my name saying, 'I am Christ': and shall deceive many.

Matthew 24:11

And many false prophets shall arise, and shall deceive many.

John 12:39-43

Therefore could they not believe, because that Isaiah saith again,

Romans 1:21-25

inasmuch as when they knew God, they glorified him not as God, neither were thankful: but waxed full of vanities in their imaginations. And their foolish hearts were blinded.

1 Thessalonians 2:3

Our exhortation was not to bring you to error, nor yet to uncleanness, neither was it with guile:

1 Timothy 4:1

The spirit speaketh evidently that in the latter times some shall depart from the faith, and shall give heed unto spirits of error,

Treasury of Scripture Knowledge

Summary

And for this cause God shall send them strong delusion, that they should believe a lie:

Bible References

General references

Exodus 8:7
And the sorcerers did likewise with their sorcery, and the frogs came up upon the land of Egypt.
Exodus 10:20
But the LORD hardened Pharaoh's heart, so that he would not let the children of Israel go.
Leviticus 13:29
When either man or woman hath a breaking out upon the head or the beard, let the priest see it.
Deuteronomy 13:2
and that sign or wonder which he hath said come to pass - and then say, 'Let us go after strange gods which thou hast not known, and let us serve them':
Deuteronomy 28:28
And the LORD shall smite thee with madness, blindness and dazing of heart.
Deuteronomy 29:4
And yet the LORD hath not given you a heart to perceive, nor eyes to see, nor ears to hear unto this day.
Psalm 109:17
His delight was in cursing, and therefore shall it happen unto him; he loved not blessing, therefore shall it be far from him.
Isaiah 47:12
Now go to thy conjurers, and to the multitude of thy witches, whom thou hast been acquainted with from thy youth, if they may help thee, or strengthen thee.