'Testify Concerning' in the Bible

If I testify concerning myself, my testimony is not true.

But I have a testimony greater than that of John: for the works that the Father hath given me that I may perfect them, these works which I do, testify concerning me, that the Father hath sent me.

Search the Scriptures, because in them ye think ye have eternal life; and they are they which testify concerning me;

If I testify concerning myself, my testimony is true; for I know whence I came, and whither I go. You know not whence I come, or whither I go.

If thou art the Christ, tell us openly. Jesus responded, I told you, and you do not believe: the works which I do in the name of my Father, these testify concerning me.