Luke 24:25

And he said to them, O ye unwise, and slow in heart to believe in all things which the prophets spake:

Mark 7:18

And he says, So are ye also without understanding? Do ye not perceive, that anything from without entering into a man, cannot pollute him

Mark 8:17-18

And Jesus having known, says to them, Why reason ye with yourselves, because ye have no loaves? observe ye not yet, neither understand? have ye your heart yet hardened?

Mark 9:19

And he having answered, says to 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

Afterwards to those reclining at table was he manifested, and he reproached their unbelief and hard heart, because they believed not them having seen him raised.

Hebrews 5:11-12

Of whom great is the word to us, and difficult of interpretation to speak, since ye have been sluggish in the hearing.

Treasury of Scripture Knowledge

Summary

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

General references

Bible References

O fools

Mark 7:18
And he says, So are ye also without understanding? Do ye not perceive, that anything from without entering into a man, cannot pollute him
Mark 8:17
And Jesus having known, says to them, Why reason ye with yourselves, because ye have no loaves? observe ye not yet, neither understand? have ye your heart yet hardened?
Mark 9:19
And he having answered, says to 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
Afterwards to those reclining at table was he manifested, and he reproached their unbelief and hard heart, because they believed not them having seen him raised.
Hebrews 5:11
Of whom great is the word to us, and difficult of interpretation to speak, since ye have been sluggish in the hearing.

General references

Matthew 26:54
How then would the writings be filled up, that so it must be?
Mark 7:18
And he says, So are ye also without understanding? Do ye not perceive, that anything from without entering into a man, cannot pollute him
Luke 18:34
And they understood nothing of these things: and this word was hidden from them, and they discerned not the things spoken.