'Witness' in the Bible

It will become a sign and a witness to the Lord of hosts in the land of Egypt; for they will cry to the Lord because of oppressors, and He will send them a Savior, a [Great] Defender, and He will rescue them.

Stop and take some time and wonder [at this prophecy],Blind yourselves and be blinded [at its fulfillment by your spiritual incompetence].They are drunk, but not from wine;They stagger, but not from strong drink.

Now, go, write it on a tablet before themAnd inscribe it on a scroll,So that it may serve in the time to comeAs a witness [against them] forevermore.

“You have heard [these things foretold]; look at all this [that has been fulfilled].And you, will you not declare it?I proclaim to you [specific] new things from this time,Even hidden things which you have not known.

The Lord has bared His holy arm (His infinite power)Before the eyes of all the nations [revealing Himself as the One by Whom Israel is redeemed from captivity],That all the ends of the earth may seeThe salvation of our God.

“Listen carefully, I have appointed him [David, representing the Messiah] to be a witness to the nations [regarding salvation],A leader and commander to the peoples.