Luke 24:25

And he said to them: inconsiderate, and slow of heart to believe all things that the prophets have spoken!

Mark 7:18

And he said to them: Are you also so void of understanding? Do you not perceive that nothing from without, by entering into a man, can defile him?

Mark 8:17-18

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

Mark 9:19

And he answered them, and said: faithless generation! how long shall I be with you? how long shall I bear with you? Bring him to me.

Mark 16:14

Afterward he appeared to the eleven as they reclined at table; and he reproached 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

Of him we have many things to say, and difficult to be explained, if we do say them, since you are slow in understanding.

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 void of understanding? Do you not perceive that nothing from without, by entering into a man, can defile him?

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

And he answered them, and said: faithless generation! how long shall I be with you? how long shall I bear with you? Bring him to me.

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

Of him we have many things to say, and difficult to be explained, if we do say them, since you are slow in understanding.

General references

But how then shall the scriptures be fulfilled, that thus it must be?

And he said to them: Are you also so void of understanding? Do you not perceive that nothing from without, by entering into a man, can defile him?

And they understood none of these things; and this saying was concealed from them; and they understood not the things that were spoken.