'Testimony' in the Bible

“Therefore [you of the godly remnant of Judah, patiently] wait for Me,” declares the Lord,“[Wait] for the day when I rise up as a witness [against the nations].For it is My decision and My right to gather the nations,To assemble kingdoms,To pour out on them My indignation,All [the heat of] My burning anger;For [in that day] all the earth shall be consumedBy the fire of My zeal.