# Why do we still need a witness?

They use a question for emphasis. Alternate translation: "We have no further need for witnesses!" (See: [[rc://en/ta/man/translate/figs-rquestion]])

# heard from his own mouth

The phrase "his own mouth" refers to his speech. Alternate translation: "heard him say that he believes he is the Son of God" (See: [[rc://en/ta/man/translate/figs-metonymy]])