John 17:11-12

John 17:11-12. And now I am no more in the world, but these are in the world, and I come to thee. Holy Father, keep through thine own name those whom thou hast given me, that they may be one, as we are. While I was with them in the world, I kept them in thy name: those that thou gavest me I have kept, and none of them is lost, but the son of perdition; that the scripture might be fulfilled.

It was known and foretold that Judas would be lost; therefore, the Saviour, the great Keeper of the sheep, is not to be held responsible for the loss of "the son of perdition", who was never committed to his charge.