'Testify' in the Bible

And he commanded us to preach to the people and to testify solemnly that this one is the one appointed by God [as] judge of the living and of the dead.

To this one all the prophets testify, [that] through his name everyone who believes in him receives forgiveness of sins."

But I consider [my] life [as] worth {nothing} to myself, in order to finish my mission and the ministry that I received from the Lord Jesus, to testify [to] the gospel of the grace of God.

Therefore I testify to you on this very day that I am guiltless of the blood of all [of you],

as indeed the high priest and the whole council of elders can testify about me, from whom also I received letters to the brothers in Damascus, [and] was traveling [there] to lead away those who were there also tied up to Jerusalem so that they could be punished.

And the next night the Lord stood by him [and] said, "Have courage, for as you have testified about me in Jerusalem, so you must also testify in Rome."

having known me for a long time, if they are willing to testify, that in accordance with the strictest party of our religion I lived [as] a Pharisee.