'Testifying' in the Bible

I assure you and most solemnly say to you, we speak only of what we [absolutely] know and testify about what we have [actually] seen [as eyewitnesses]; and [still] you [reject our evidence and] do not accept our testimony.

And from that city many believed in him, of the Samaritans, because of the word of the woman testifying, -- 'He told me all things -- as many as I did.'

another there is who is testifying concerning me, and I have known that the testimony that he doth testify concerning me is true;

'Ye search the Writings, because ye think in them to have life age-during, and these are they that are testifying concerning me;

The world cannot hate you, but it hates me, because I am testifying about it that its deeds are evil.

So the Pharisees said to Him, “You are testifying about Yourself. Your testimony is not valid.”

Jesus answered them, "Even though I'm testifying about myself, my testimony is valid because I know where I've come from and where I'm going. But you don't know where I come from or where I'm going.

I'm testifying about myself, and the Father who sent me is testifying about me."

The multitude, therefore, who are with him, were testifying that he called Lazarus out of the tomb, and did raise him out of the dead;

This is the disciple who is testifying to these things and has written them down. We know that his testimony is true.