'Valid' in the Bible

The Pharisees told him, "You're testifying about yourself. Your testimony isn't valid."

Jesus answered them, "Even though I'm testifying about myself, my testimony is valid because I know where I've come 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.

In your own Law it is written that the testimony of two people is valid.