Luke 24:25

And he said to them, O foolish men, and of a mind slow to believe all that the prophets have spoken.

Mark 7:18

And he said to them, Are you also so without understanding? Do you not understand that nothing which enters into a man from without can defile him,

Mark 8:17-18

And Jesus knowing it, said to them, Why do you reason because you have no bread? Do you not yet perceive nor understand? Is your heart hardened?

Mark 9:19

And he answered and said to them, O faithless and perverse generation! How long shall I be with you? How long shall I suffer you? Bring him to me.

Mark 16:14

And afterwards he appeared to the eleven, as they reclined, and reproached their unbelief and hardness of heart, because they believed not those who had seen him since he rose from the dead.

Hebrews 5:11-12

Concerning whom we have much to say, and that which is difficult to explain, because you have become dull of hearing.

Treasury of Scripture Knowledge

Summary

Luke 24:25

Then he said unto them, O fools, and slow of heart to believe all that the prophets have spoken:

O fools

Hebrews 5:11

General references

Matthew 26:54

Mark 7:18

Luke 18:34

Bible References

O fools

And he said to them, Are you also so without understanding? Do you not understand that nothing which enters into a man from without can defile him,

And Jesus knowing it, said to them, Why do you reason because you have no bread? Do you not yet perceive nor understand? Is your heart hardened?

And he answered and said to them, O faithless and perverse generation! How long shall I be with you? How long shall I suffer you? Bring him to me.

And afterwards he appeared to the eleven, as they reclined, and reproached their unbelief and hardness of heart, because they believed not those who had seen him since he rose from the dead.

Concerning whom we have much to say, and that which is difficult to explain, because you have become dull of hearing.

General references

How then would the Scriptures be accomplished, that it must be so?

And he said to them, Are you also so without understanding? Do you not understand that nothing which enters into a man from without can defile him,

And they understood nothing of these things; and this word was concealed from them, and they did not perceive what was said.