'Clean' in the Bible

For thou sayest, My doctrine is pure, and I am clean in thine eyes.

Who can bring a clean man out of the unclean? Not one!

But the righteous shall hold on his way, and he that hath clean hands shall increase in strength.

And how should man be just with God? Or how should he be clean that is born of a woman?

I am clean without transgression; I am pure, and there is no iniquity in me;