'Testify' in the Bible

"As for yourselves, be on your guard! People will hand you over to local councils, and you will be beaten in their synagogues. You will stand before governors and kings to testify to them because of me.

And the chief priest, having risen up in the midst, questioned Jesus, saying, 'Thou dost not answer anything! what do these testify against thee?'

And Pilate again questioned him, saying, 'Thou dost not answer anything! lo, how many things they do testify against thee!'