Mark 4:12
that in seeing they may see and not perceive, and in hearing they may hear and not understand, least they should be converted, and their sins be forgiven them.
Luke 8:10
And He said, To you it is granted to know the mysteries of the kingdom of God: but I speak to others in parables, that in seeing they may not see, and hearing they may not understand.
Matthew 13:14-15
And in them is fulfilled the prophecy of Isaiah, which saith, Ye shall hear by the hearing of the ear, and not understand; and in seeing ye shall see, and not perceive: for the heart of this people is grown stupid,
Romans 11:8
(according as it is written, God hath given them a spirit of slumber, that their eyes could not see and their ears could not hear,) even unto this day.
John 12:40
He hath blinded their eyes, and hardened their heart, that they might not see with their eyes, and understand with their heart, and be converted, and I should heal them.
Acts 28:26-27
saying, Go to this people and say, Ye shall hear by the hearing of the ear, and not understand; and in seeing ye shall see, and not perceive: for the heart of this people is stupified,