'Valid' in the Bible

“If I testify about Myself, My testimony is not valid.

There is Another who testifies about Me, and I know that the testimony He gives about Me is valid.

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

“Even if I testify about Myself,” Jesus replied, “My testimony is valid, because I know where I came from and where I’m going. But you don’t know where I come from or where I’m going.

Yet even if I should judge, my judgment would be valid, because it is not I alone who judges, but I and the one who sent me.

Even in your law it is written that the witness of two men is valid.

If I had not come and spoken to them, they would not have sin. But now they do not have a valid excuse for their sin.