'Witness' in the Bible

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.

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.