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According to commentaries, it's either Judas and friends such as Caiaphas.
"therefore he that delivered me unto thee, hath the greater sin; , "than thine", as the Syriac version adds; and to the same purpose the Persic. Pilate had been guilty of sin already in scourging Christ, and suffering the Roman soldiers to abuse him; and would be guilty of a greater in delivering him up to be crucified, who he knew was innocent: but the sin of Judas in delivering him into the hands of the chief priests and elders, and of the chief priest and elders and people of the Jews, in delivering him to Pilate to crucify him, according to the Roman manner, were greater, inasmuch as theirs proceeded from malice and envy, and was done against greater light and knowledge; for by his works, miracles, and ministry, as well as by their own prophecies, they might, or must have known, that he was the Messiah, and Son of God: and it is to be observed, that as there is a difference in sin, and that all sins are not equal, the circumstances of things making an alteration; so that God's decree concerning the delivery of his Son into the hands of sinful men, does not excuse the sin of the betrayers of him."
John 19:11. Οὐδεμίαν, no power at all) either to crucify or to let go, or any other power.—δεδομένον, given) It had been given to Pilate to have power.—διὰ τοῦτο, therefore) Because thou hast not known (dost not know) Me at all.—ὁ παραδιδούς μέ σοι, he who hath delivered Me to thee) This was Caiaphas. Pilate, when he heard mention, however, made of the Son of God, was afraid: Caiaphas, when he had heard from the Lord Himself that He was the Son of God, called Him a blasphemer, and judicially pronounced Him “guilty of death” [Matthew 26:65-66].
Caiaphas might have recognized Christ's true Messiahship, and accepted his true claims, and bowed before him as the Sent of God, as the Son of the Blessed; but instead of this he had violated the law, and sacrificed the hope and spiritual independence of his own people, out of deference to the sacrosanct honors of his own order. Pilate's consciousness of independence is rebuked, and his conscience appealed to, and the Lord, in this last word to his judge, claims to be his Suzerain, and awards to him his share of blame. Pilate said to the Jews, "I find no fault in him;" Jesus said to Pilate, "Thou hast committed a great sin, though there is another God-given ἔξουσια, which is more seriously and culpably trifled with than thine is: he that delivered me to thee hath committed a greater." John 19:11
You're a demon, shilling for Lucifer.