Luke 24:25

And he said to them, "O foolish men, and slow of heart to believe all that the prophets have spoken!

Mark 7:18

So he said to them, "Are you also without understanding? Do you not see that whatever enters a man from outside cannot defile him,

Mark 8:17-18

Being aware of it, Jesus said to them, "Why do you discuss the fact that you have no bread? Do you not yet perceive or understand? Are your hearts hardened?

Mark 9:19

He answered him, "O faithless generation, how long shall I be with you? How long shall I bear with you? Bring him to me."

Mark 16:14

Later he appeared to the eleven as they sat at the table; and he rebuked them for their unbelief and hardness of heart, because they did not believe those who had seen him after he had risen.

Hebrews 5:11-12

About this we have much to say which is hard to explain, since 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

So he said to them, "Are you also without understanding? Do you not see that whatever enters a man from outside cannot defile him,

Being aware of it, Jesus said to them, "Why do you discuss the fact that you have no bread? Do you not yet perceive or understand? Are your hearts hardened?

He answered him, "O faithless generation, how long shall I be with you? How long shall I bear with you? Bring him to me."

Later he appeared to the eleven as they sat at the table; and he rebuked them for their unbelief and hardness of heart, because they did not believe those who had seen him after he had risen.

About this we have much to say which is hard to explain, since you have become dull of hearing.

General references

But how then could the Scriptures be fulfilled, that it must happen in this way?"

So he said to them, "Are you also without understanding? Do you not see that whatever enters a man from outside cannot defile him,

But they understood none of these things; this saying was hidden from them, and they did not know what he was talking about.