Bilangan 35:30

35:30 “Whoever kills any person, the murderer must be put to death by the testimony ¹  of witnesses; but one witness cannot ²  testify against any person to cause him to be put to death.

Ulangan 17:6

17:6 At the testimony of two or three witnesses they must be executed. They cannot be put to death on the testimony of only one witness.

¹ tn Heb “ at the mouth of”; the metonymy stresses it is at their report.

² tn The verb should be given the nuance of imperfect of potentiality.