31 Then said Pilate unto them, Take ye him, and judge him according to your law. The Jews therefore said unto him, It is not lawful for us to put any man to death: 32 That the saying of Jesus might be fulfilled, which he spake, signifying what death he should die. (John 18:31-32 KJV)
William Burkitt’s Commentary
The Jews being now under the power of the Romans, though they had a power of judging and censuring criminals in smaller matters, yet not in capital cases; they could not pronounce a sentence of death upon any person, say some; they might, and did, say others, punish blasphemers by stoning them to death; but then their sentence is to be ratified by the Roman power. Accordingly, here they had in their ecclessiastical court condemned Christ for blasphemy, now they bring him to Pilate the Roman governor, to confirm the sentence of death.
From hence it appears, that Christ was the true Messias, being sent into the world when the sceptre was departed from Judah, according to that ancient prophecy of Jacob, The sceptre shall not depart from Judah until Shiloh come Genesis 49:10.
The Jews had no power absolutely to condemn any man, or put him to death; but his power the Roman emperor reserved to his own deputy. This contributed towards the fulfilling of our Saviour’s words, That he should be delivered to the Gentiles, and should be crucified Matthew 20:19: which was not a Jewish, but a Roman punishment.
Had the Jews put him to death, they had stoned him. But Christ was to be made a curse for us by hanging upon a tree; and accordingly the Jews execute the counsel of God, though they knew it not, by refusing to put him to death themselves.
Learn hence, how willing Christ was to undergo a shameful, painful, and accursed death, that he might testify his love unto, and procure a blessing for, his people. Thus the saying of Jesus was fulfilled; when he spake, signifying what death he should die.