John 8:27

Howbeit, they understood not that he spake of his father.

Isaiah 6:9

And so he said, "Go, and tell this people: 'Ye shall hear indeed, but ye shall not understand; ye shall plainly see, and not perceive.

Isaiah 42:18-20

Hear, O ye deaf men, and sharpen your sights to see, O ye blind!

Isaiah 59:10

We grope like the blind upon the wall, we grope even as one that hath none eyes. We stumble at the noonday, as though it were toward night; in the falling places, like men that are half dead.

John 8:43

Why do ye not know my speech? Even because ye cannot abide the hearing of my words.

John 8:47

He that is of God, heareth God's words. Ye therefore hear them not, because ye are not of God."

Romans 11:7-10

What then? Israel hath not obtained that that he sought. No but yet the election hath obtained it. The remnant are blinded,

2 Corinthians 4:3-4

If our Gospel be yet hid, it is hid among them that are lost,

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

John 8:43
Why do ye not know my speech? Even because ye cannot abide the hearing of my words.
Isaiah 6:9
And so he said, "Go, and tell this people: 'Ye shall hear indeed, but ye shall not understand; ye shall plainly see, and not perceive.
Isaiah 42:18
Hear, O ye deaf men, and sharpen your sights to see, O ye blind!
Isaiah 59:10
We grope like the blind upon the wall, we grope even as one that hath none eyes. We stumble at the noonday, as though it were toward night; in the falling places, like men that are half dead.
Romans 11:7
What then? Israel hath not obtained that that he sought. No but yet the election hath obtained it. The remnant are blinded,
2 Corinthians 4:3
If our Gospel be yet hid, it is hid among them that are lost,