'Witness' in the Bible

beginning from his baptism by John until the day he was taken up from us -- one of these must become a witness of his resurrection together with us."

yet he did not leave himself without a witness by doing good, by giving you rain from heaven and fruitful seasons, satisfying you with food and your hearts with joy."

because you will be his witness to all people of what you have seen and heard.

And when the blood of your witness Stephen was shed, I myself was standing nearby, approving, and guarding the cloaks of those who were killing him.'

But get up and stand on your feet, for I have appeared to you for this reason, to designate you in advance as a servant and witness to the things you have seen and to the things in which I will appear to you.