John 13:18

I speak not of you all: I know whom I have chosen: but that the Scripture might be fulfilled, he that eateth my bread lifted up his heel against me.

McGarvey paraphrased this thus:

I do not speak of blessing you all, for there is one who shall never be blessed. His conduct does not deceive or surprise me, for I know those whom I have chosen whether they be good or bad.[5]

That the Scripture might be fulfilled ... Even the treachery of an apostle was prophesied in Psalms 41:9, which reads:

Yea, mine own familiar friend, in whom I trusted, Who did eat of my bread, Hath lifted up his heel against me.

Of the Twelve, only Judas carried the bag and sat next to Jesus at the table, even dipping his hand in the dish with him. The Psalm cited, therefore, has the effect of a positive identification of Judas as the traitor. There is no implication in this, that Jesus chose Judas for the purpose of the betrayal. God's foreseeing future events imposes upon those events no necessity of happening, any more than a mortal's knowledge of past events caused them to occur.