'Testimony' in the Bible

This is John's testimony, when the Jews sent priests and Levites from Jerusalem to ask him, "Who are you?"

It is another who testifies about me. I know that the testimony which he testifies about me is true.

But the testimony which I receive is not from man. However, I say these things that you may be saved.

But the testimony which I have is greater than that of John, for the works which the Father gave me to accomplish, the very works that I do, testify about me, that the Father has sent me.

The Pharisees therefore said to him, "You testify about yourself. Your testimony is not valid."

Jesus answered them, "Even if I testify about myself, my testimony is true, for I know where I came from, and where I am going; but you don't know where I came from, or where I am going.

It's also written in your law that the testimony of two people is valid.

He who has seen has testified, and his testimony is true. He knows that he tells the truth, that you may believe.