'Testify' in the Bible

About him all the prophets testify, that everyone who believes in him receives forgiveness of sins through his name."

But I do not consider my life worth anything to myself, so that I may finish my task and the ministry that I received from the Lord Jesus, to testify to the good news of God's grace.

as both the high priest and the whole council of elders can testify about me. From them I also received letters to the brothers in Damascus, and I was on my way to make arrests there and bring the prisoners to Jerusalem to be punished.

The following night the Lord stood near Paul and said, "Have courage, for just as you have testified about me in Jerusalem, so you must also testify in Rome."

They know, because they have known me from time past, if they are willing to testify, that according to the strictest party of our religion, I lived as a Pharisee.