'Testimony' in the Bible

And he ordered him, "Tell no one, but go [and] show yourself to the priest and bring [the offering] for your cleansing just as Moses commanded, for a testimony to them.

And [as for] all those who do not welcome you--[when you] depart from that town, shake off the dust from your feet for a testimony against them."

You know the commandments: 'Do not commit adultery, do not murder, do not steal, do not give false testimony, honor your father and mother.'"

And they said, "Why do we have need [of] further testimony? For [we] ourselves have heard [it] from his mouth!"