'Prove' in the Bible

You shall take in your hand this staff, with which you shall perform the signs [the miracles which prove I sent you].”

“When Pharaoh says to you, ‘Work a miracle [to prove your authority],’ then you say to Aaron, ‘Take your staff and throw it down before Pharaoh, so that it may become a serpent.’”

Then the Lord said to Moses, “Behold, I will cause bread to rain from heaven for you; the people shall go out and gather a day’s portion every day, so that I may test them [to determine] whether or not they will walk [obediently] in My instruction (law).

Moses said to the people, “Do not be afraid; for God has come in order to test you, and in order that the fear of Him [that is, a profound reverence for Him] will remain with you, so that you do not sin.”