'Adversary' in the Bible

Agree with thine adversary quickly, whiles thou art in the way with him; lest at any time the adversary deliver thee to the judge, and the judge deliver thee to the officer, and thou be cast into prison.

When thou goest with thine adversary to the magistrate, as thou art in the way, give diligence that thou mayest be delivered from him; lest he hale thee to the judge, and the judge deliver thee to the officer, and the officer cast thee into prison.

And there was a widow in that city; and she came unto him, saying, Avenge me of mine adversary.

I will therefore that the younger women marry, bear children, guide the house, give none occasion to the adversary to speak reproachfully.

Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour: