John 8:27

They noted not that, as touching the Father, unto them, he was speaking.

Isaiah 6:9

Then said be - Go and say unto this people, - Hear on but do not discern, See on but do not perceive:

Isaiah 42:18-20

Ye deaf hear! And ye blind look around that ye may see, Who is blind if not my Servant? Or deaf, like, my messenger whom I send?

Isaiah 59:10

We grope, as blind men for a wall, Yea, as men without eyes, do we grope, - We have stumbled at broad noon as though it were twilight, In desolate places like the dead!

John 8:43

Wherefore, is it, that, my speech, ye do not understand? because ye cannot hear my word.

John 8:47

He that is of God, heareth, the sayings of God; therefore, do, ye, not hear, because, of God, ye are not.

Romans 11:7-10

What then? That which Israel seeketh after, the same, it hath not obtained: - the election, however, have obtained it, and, the rest, have been hardened; -

2 Corinthians 4:3-4

And, even if our glad-message is veiled, in them who are perishing, it is veiled,

Treasury of Scripture Knowledge

Summary

They understood not that he spake to them of the Father.

Bible References

General references

John 8:43
Wherefore, is it, that, my speech, ye do not understand? because ye cannot hear my word.
Isaiah 6:9
Then said be - Go and say unto this people, - Hear on but do not discern, See on but do not perceive:
Isaiah 42:18
Ye deaf hear! And ye blind look around that ye may see, Who is blind if not my Servant? Or deaf, like, my messenger whom I send?
Isaiah 59:10
We grope, as blind men for a wall, Yea, as men without eyes, do we grope, - We have stumbled at broad noon as though it were twilight, In desolate places like the dead!
Romans 11:7
What then? That which Israel seeketh after, the same, it hath not obtained: - the election, however, have obtained it, and, the rest, have been hardened; -
2 Corinthians 4:3
And, even if our glad-message is veiled, in them who are perishing, it is veiled,