'Testify' in the Bible

And He ordered us to preach to the people, and solemnly to testify that this is the One who has been appointed by God as Judge of the living and the dead.

But I do not consider my life of any account as dear to myself, so that I may finish my course and the ministry which I received from the Lord Jesus, to testify solemnly of the gospel of the grace of God.

Therefore, I testify to you this day that I am innocent of the blood of all men.

as also the high priest and all the Council of the elders can testify. From them I also received letters to the brethren, and started off for Damascus in order to bring even those who were there to Jerusalem as prisoners to be punished.

since they have known about me for a long time, if they are willing to testify, that I lived as a Pharisee according to the strictest sect of our religion.