'Reliable' in the Bible

Jesus replied, “Even if I do testify on My own behalf, My testimony is valid, because I know where I came from and where I am going; but you do not know where I come from or where I am going.

Even in your own law it is written that the testimony of two persons is true [valid and admissible].

I have many things to say and judge concerning you, but He who sent Me is true; and I say to the world [only] the things that I have heard from Him.”