'Witness' in the Bible

Attempting to see what sort of time the Spirit of Christ which was in them was pointing to, when it gave witness to the pains which Christ would undergo and the glories which would come after them.

Live honourable lives among the Gentiles, in order that, although they now speak against you as evil-doers, they may yet witness your good conduct, and may glorify God on the day of reward and retribution.

The elders which are among you I exhort, who am also an elder, and a witness of the sufferings of Christ, and also a partaker of the glory that shall be revealed:

I send this short letter by Silas, our faithful brother--for such I regard him--in order to encourage you, and to bear witness that what I have told you is the true grace of God. In it stand fast.