John Chrysostom
Then, lest they become more negligent on learning that the believer receives salvation while the unbeliever is not punished, see how He sets the dread judgment before them.
He adds these words: "He who rejects Me and does not receive My words has one who judges him" (v. 48).
But if the Father judges no one, and You did not come to judge the world, who will judge him? "The word that I have spoken will judge him on the last day" (v. 48).
Since they said that He was not from God, He spoke in this way. He showed that then they would have no possibility of saying this.
The words that I now have spoken will stand in the place of an accuser. They will convict them and take away every excuse.
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"And the word that I have spoken." What word? "For I did not come of Myself, but the Father who sent Me gave Me a commandment, what I should say and what I should speak" (v. 49), and all other similar words.