One witness shall not testify against any person— This is a wise precaution to prevent the shedding of innocent blood. The Jews tell us, that where there was but one witness, though he who was accused of the murder could not be put to death, yet he was thrown into a very strait prison, and there fed with bread and water.
Related Commentaries of Numbers 35:30
Numbers 35:30
30 Whoso killeth any person, the murderer shall be put to death by the mouth of witnesses: but one witness shall not testify against any person to cause him to die.