Luke's Jesus predicts it, but Luke never says that Pontius Pilate scourged Jesus or that Jesus was scourged

And they shall scourge him, and put him to death: and the third day he shall rise again.

-- Luke 18:33

Then released he Barabbas unto them: and when he had scourged Jesus, he delivered him to be crucified.

-- Matthew 27:26

And so Pilate, willing to content the people, released Barabbas unto them, and delivered Jesus, when he had scourged him, to be crucified.

-- Mark 15:15

Then Pilate therefore took Jesus, and scourged him.

-- John 19:1