John 19:7

"We," replied the Jews, "have a Law, and in accordance with that Law he ought to die, for having claimed to be the Son of God."

John 5:18

On this account then the Jews were all the more eager to put Him to death--because He not only broke the Sabbath, but also spoke of God as being in a special sense His Father, thus putting Himself on a level with God.

Matthew 26:63-66

Jesus however remained silent. Again the High Priest addressed Him. "In the name of the ever-living God," he said, "I now put you on your oath. Tell us whether you are the Christ, the Son of God."

Romans 1:4

but as regards the holiness of His Spirit was decisively proved by His Resurrection to be the Son of God--I mean concerning Jesus Christ our Lord,

Matthew 27:42-43

"He saved others," they said, "himself he cannot save! He is the King of Israel! Let him now come down from the cross, and we will believe in him.

Mark 14:61-64

But He remained silent, and gave no reply. A second time the High Priest questioned Him. "Are you the Christ, the Son of the Blessed One?" he said.

Mark 15:39

And when the Centurion who stood in front of the cross saw that He was dead, he exclaimed, "This man was indeed God's Son."

John 8:58-59

"In most solemn truth," answered Jesus, "I tell you that before Abraham came into existence, I am."

John 10:30-33

I and the Father are one."

John 10:36-38

how is it that you say to one whom the Father consecrated and sent into the world, 'You are blaspheming,' because I said, 'I am God's Son'?

Treasury of Scripture Knowledge

Summary

The Jews answered him, We have a law, and by our law he ought to die, because he made himself the Son of God.

General references

Bible References

Because

John 5:18
On this account then the Jews were all the more eager to put Him to death--because He not only broke the Sabbath, but also spoke of God as being in a special sense His Father, thus putting Himself on a level with God.
John 8:58
"In most solemn truth," answered Jesus, "I tell you that before Abraham came into existence, I am."
John 10:30
I and the Father are one."
Matthew 26:63
Jesus however remained silent. Again the High Priest addressed Him. "In the name of the ever-living God," he said, "I now put you on your oath. Tell us whether you are the Christ, the Son of God."
Matthew 27:42
"He saved others," they said, "himself he cannot save! He is the King of Israel! Let him now come down from the cross, and we will believe in him.
Mark 14:61
But He remained silent, and gave no reply. A second time the High Priest questioned Him. "Are you the Christ, the Son of the Blessed One?" he said.
Mark 15:39
And when the Centurion who stood in front of the cross saw that He was dead, he exclaimed, "This man was indeed God's Son."
Romans 1:4
but as regards the holiness of His Spirit was decisively proved by His Resurrection to be the Son of God--I mean concerning Jesus Christ our Lord,

General references

Mark 14:64
You all heard his impious words. What is your judgement?" Then with one voice they condemned Him as deserving of death.