'Testimony' in the Bible

Then he ordered the man to tell no one, but commanded him, "Go and show yourself to a priest, and bring the offering for your cleansing, as Moses commanded, as a testimony to them."

Wherever they do not receive you, as you leave that town, shake the dust off your feet as 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.'"

Then they said, "Why do we need further testimony? We have heard it ourselves from his own lips!"