'Eye witnesses' in the Bible

having your conduct ornamental among the Gentiles: that, whereas they malign you as wicked doers, they may, being eye-witnesses of your good works, glorify God in the day when he visits them.

being eye-witnesses of your chaste behaviour with timidity.

For we have not followed artfully devised fables, when we made known to you the power and advent of our Lord Jesus Christ, but were eye-witnesses of his majesty.