This can be stated in active form. Alternate translation: "according to the testimony of witnesses" or "as witnesses testify to the murder" (See: [[rc://en/ta/man/translate/figs-activepassive]])
The testimony of one witness is not enough to execute a person for murder. This can be stated in active form. Alternate translation: "But the word of only one witness is not enough for you to execute a person" (See: [[rc://en/ta/man/translate/figs-activepassive]])