Matthew 13:14

And in them is fulfilled the prophecy of Isaiah which said, "By hearing you shall hear and shall not understand; and seeing you shall see and shall not perceive;

Isaiah 6:9-10

And He said, Go, and tell this people, You hear indeed, but do not understand; and seeing you see, but do not know.

Mark 4:12

so that seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.

Luke 8:10

And He said, To you it is given to know the mysteries of the kingdom of God. But to others I speak in parables, so that seeing they might not see and hearing they might not understand.

Ezekiel 12:2

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

John 12:39-40

Therefore they could not believe, because Isaiah said again,

Acts 28:25-27

And disagreeing with one another, they were let go, Paul saying one word: Well did the Holy Spirit speak through Isaiah the prophet to our fathers,

Romans 11:8-10

even as it is written, "God gave to them a spirit of slumber, eyes not seeing, and ears not hearing" until this day.

2 Corinthians 3:14

(But their thoughts were blinded; for until the present the same veil remains on the reading of the old covenant, not taken away.) But this veil has been done away in Christ.

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 tell this people, You hear indeed, but do not understand; and seeing you see, but do not know.
Ezekiel 12:2
Son of man, you dwell in the midst of a rebellious house, who have eyes to see and see not. They have ears to hear and hear not, for they are a rebellious house.
Mark 4:12
so that seeing they may see, and not perceive; and hearing they may hear, and not understand; lest at any time they should be converted, and their sins should be forgiven them.
Luke 8:10
And He said, To you it is given to know the mysteries of the kingdom of God. But to others I speak in parables, so that seeing they might not see and hearing they might not understand.
John 12:39
Therefore they could not believe, because Isaiah said again,
Acts 28:25
And disagreeing with one another, they were let go, Paul saying one word: Well did the Holy Spirit speak through Isaiah the prophet to our fathers,
Romans 11:8
even as it is written, "God gave to them a spirit of slumber, eyes not seeing, and ears not hearing" until this day.
2 Corinthians 3:14
(But their thoughts were blinded; for until the present the same veil remains on the reading of the old covenant, not taken away.) But this veil has been done away in Christ.

General references

Leviticus 13:29
If a man or woman has in them a plague on the head or the beard,
Deuteronomy 29:4
Yet Jehovah has not given you a heart to perceive, and eyes to see, and ears to hear, until today.
Deuteronomy 32:28
For they are a nation without wisdom, neither is there any understanding in them.
Proverbs 20:12
The hearing ear and the seeing eye, Jehovah has made both of them.
Ezekiel 17:2
Son of man, put out a riddle and speak a parable to the house of Israel.
Matthew 24:39
And they did not know until the flood came and took them all away. So also will be the coming of the Son of Man.