Matthew 13:14

Indeed, in their case the prophecy of Isaiah is fulfilled that says: "'You will indeed hear but never understand, and you will indeed see but never perceive.

Isaiah 6:9-10

And he said, "Go, and say to this people: "'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'

Mark 4:12

so that "they may indeed see but not perceive, and may indeed hear but not understand, lest they should turn and be forgiven."

Luke 8:10

he said, "To you it has been given to know the secrets of the kingdom of God, but for others they are in parables, so that 'seeing they may not see, and hearing they may not understand.'

Ezekiel 12:2

"Son of man, you dwell in the midst of a rebellious house, who have eyes to see, but see not, who have ears to hear, but hear not, for they are a rebellious house.

John 12:39-40

Therefore they could not believe. For again Isaiah said,

Acts 28:25-27

And disagreeing among themselves, they departed after Paul had made one statement: "The Holy Spirit was right in saying to your fathers through Isaiah the prophet:

Romans 11:8-10

as it is written, "God gave them a spirit of stupor, eyes that would not see and ears that would not hear, down to this very day."

2 Corinthians 3:14

But their minds were hardened. For to this day, when they read the old covenant, that same veil remains unlifted, because only through Christ is it taken away.

Treasury of Scripture Knowledge

Summary

And in them is fulfilled the prophecy of Esaias, which saith, By hearing ye shall hear, and shall not understand; and seeing ye shall see, and shall not perceive:

Bible References

The prophecy

Isaiah 6:9
And he said, "Go, and say to this people: "'Keep on hearing, but do not understand; keep on seeing, but do not perceive.'
Ezekiel 12:2
"Son of man, you dwell in the midst of a rebellious house, who have eyes to see, but see not, who have ears to hear, but hear not, for they are a rebellious house.
Mark 4:12
so that "they may indeed see but not perceive, and may indeed hear but not understand, lest they should turn and be forgiven."
Luke 8:10
he said, "To you it has been given to know the secrets of the kingdom of God, but for others they are in parables, so that 'seeing they may not see, and hearing they may not understand.'
John 12:39
Therefore they could not believe. For again Isaiah said,
Acts 28:25
And disagreeing among themselves, they departed after Paul had made one statement: "The Holy Spirit was right in saying to your fathers through Isaiah the prophet:
Romans 11:8
as it is written, "God gave them a spirit of stupor, eyes that would not see and ears that would not hear, down to this very day."
2 Corinthians 3:14
But their minds were hardened. For to this day, when they read the old covenant, that same veil remains unlifted, because only through Christ is it taken away.

General references

Leviticus 13:29
"When a man or woman has a disease on the head or the beard,
Deuteronomy 29:4
But to this day the LORD has not given you a heart to understand or eyes to see or ears to hear.
Deuteronomy 32:28
"For they are a nation void of counsel, and there is no understanding in them.
Proverbs 20:12
The hearing ear and the seeing eye, the LORD has made them both.
Ezekiel 17:2
"Son of man, propound a riddle, and speak a parable to the house of Israel;
Matthew 24:39
and they were unaware until the flood came and swept them all away, so will be the coming of the Son of Man.

The Holy Bible, English Standard Version® copyright © 2001 by Crossway Bibles, a publishing ministry of Good News Publishers.