Matthew 13:13-14
For this reason I speak to them in parables; because seeing they do not see, and hearing they do not hear, nor understand.
Mark 4:11-12
And he said to them, To you is given the mystery of the kingdom of God, but to those without all things are in parables;
Luke 8:10
And he said, It is given to you to know the mysteries of the kingdom of God, but to others in parables; that seeing they may not see, and hearing they may not understand.
Acts 28:26
saying, Go to this people and say, Hearing you shall hear and not understand, and seeing you shall see and not perceive;
2 Corinthians 3:14-15
but their minds were blinded. For to this day in reading the old covenant the same vail remains, not taken away because it is taken away in Christ;