John 8:27

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

John 8:43

Wherefore do ye not understand my speech? because ye cannot hear my word.

John 8:47

He that is of God heareth the words of God: ye therefore do not hear him, because ye are not of God.

Romans 11:7-10

What then is the result? Israel hath not obtained that which it seeketh; but the election hath obtained it, and the rest were blinded,

2 Corinthians 4:3-4

And if now our gospel be hid, it is hid from those who 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
Wherefore do ye not understand my speech? because ye cannot hear my word.
Romans 11:7
What then is the result? Israel hath not obtained that which it seeketh; but the election hath obtained it, and the rest were blinded,
2 Corinthians 4:3
And if now our gospel be hid, it is hid from those who are lost: