If I testify concerning myself, my testimony is not worthy of credit.

There is another that testifies concerning me, and I know that the testimony which he testifies concerning me is worthy of credit.

Then the Pharisees said to him: You testify concerning yourself; your testimony is not worthy of credit.

Jesus answered and said to them: Though I testify concerning myself, my testimony is worthy of credit; for I know whence I came, and whither I go. But you know not whence I came, and whither I go.

It is also written in your law, The testimony of two is worthy of credit.