John 12:39

For this cause they couldn't believe, for Isaiah said again,

John 5:44

How can you believe, who receive glory from one another, and you don't seek the glory that comes from the only God?

Isaiah 6:9-10

He said, "Go, and tell this people, 'You hear indeed, but don't understand; and you see indeed, but don't perceive.'

Isaiah 44:18-20

They don't know, neither do they consider: for he has shut their eyes, that they can't see; and their hearts, that they can't understand.

John 6:44

No one can come to me unless the Father who sent me draws him, and I will raise him up in the last day.

John 10:38

But if I do them, though you don't believe me, believe the works; that you may know and believe that the Father is in me, and I in the Father."

2 Peter 2:14

having eyes full of adultery, and who can't cease from sin; enticing unsettled souls; having a heart trained in greed; children of cursing;

Treasury of Scripture Knowledge

Summary

Therefore they could not believe, because that Esaias said again,

Bible References

They

John 5:44
How can you believe, who receive glory from one another, and you don't seek the glory that comes from the only God?
John 6:44
No one can come to me unless the Father who sent me draws him, and I will raise him up in the last day.
John 10:38
But if I do them, though you don't believe me, believe the works; that you may know and believe that the Father is in me, and I in the Father."
Isaiah 44:18
They don't know, neither do they consider: for he has shut their eyes, that they can't see; and their hearts, that they can't understand.
2 Peter 2:14
having eyes full of adultery, and who can't cease from sin; enticing unsettled souls; having a heart trained in greed; children of cursing;

General references

Exodus 10:20
But Yahweh hardened Pharaoh's heart, and he didn't let the children of Israel go.
Deuteronomy 29:4
but Yahweh has not given you a heart to know, and eyes to see, and ears to hear, to this day.
John 1:5
The light shines in the darkness, and the darkness hasn't overcome it.
John 9:18
The Jews therefore did not believe concerning him, that he had been blind, and had received his sight, until they called the parents of him who had received his sight,
John 10:37
If I don't do the works of my Father, don't believe me.