John 8:27

They did not understand that He was speaking to them about the Father.

John 8:43

Why is it that you misunderstand what I say? It is because you cannot listen to what I teach.

John 8:47

Whoever is sprung from God listens to what God says. This is why you do not listen to me: you are not sprung from God."

Romans 11:7-10

What are we then to conclude? Israel has failed to obtain what it is still in search for, but His chosen ones have obtained it. The rest have become insensible to it,

2 Corinthians 4:3-4

If the meaning of the good news I preach is covered up at all, it is so only in the case of those who are on the way to destruction.

Treasury of Scripture Knowledge

Summary

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

Bible References

General references

John 8:43
Why is it that you misunderstand what I say? It is because you cannot listen to what I teach.
Romans 11:7
What are we then to conclude? Israel has failed to obtain what it is still in search for, but His chosen ones have obtained it. The rest have become insensible to it,
2 Corinthians 4:3
If the meaning of the good news I preach is covered up at all, it is so only in the case of those who are on the way to destruction.