'Testify' in the Bible

And with many other words did he testify and exhort, saying, Save yourselves from this untoward generation.

And he commanded us to preach unto the people, and to testify that it is he which was ordained of God to be the Judge of quick and dead.

But none of these things move me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God.

Which knew me from the beginning, if they would testify, that after the most straitest sect of our religion I lived a Pharisee.