Jesus uses this question to emphasize that he has never sinned. AT: "None of you can show that I have ever sinned!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
# If I speak the truth
"If I say things that are true"
# why do you not believe me?
Jesus uses this question to scold the Jewish leaders for their unbelief. AT: "you have no reason for not believing in me!" (See: [[rc://en/ta/man/translate/figs-rquestion]])
# the words of God
Here "words" is a metonym for the "message" of God. AT: "the message of God" or "the truth that comes from God" (See: [[rc://en/ta/man/translate/figs-metonymy]])