'Witness' in the Bible

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

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

because you will be a witness for him to all people of what you have seen and heard.

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

But get up and stand on your feet, because for this [reason] I have appeared to you, to appoint you a servant and witness both [to the things] in which you saw me and [to the things] in which I will appear to you,