Peter asks this question to clarify that this was the real reason that they were on trial. Alternate translation: "You are asking us this day ... by what means we made this man well." (See: [[rc://en/ta/man/translate/figs-rquestion]])
This can be stated in active form. Alternate translation: "by what means we have made this man well" (See: [[rc://en/ta/man/translate/figs-activepassive]])