'Opponent' in the Bible

Near is He who is justifying me, Who doth contend with me? We stand together, who is mine opponent? Let him come nigh unto me.

'Be agreeing with thy opponent quickly, while thou art in the way with him, that the opponent may not deliver thee to the judge, and the judge may deliver thee to the officer, and to prison thou mayest be cast,

for, as thou art going away with thy opponent to the ruler, in the way give diligence to be released from him, lest he may drag thee unto the judge, and the judge may deliver thee to the officer, and the officer may cast thee into prison;

and a widow was in that city, and she was coming unto him, saying, Do me justice on my opponent,

Be sober, vigilant, because your opponent the devil, as a roaring lion, doth walk about, seeking whom he may swallow up,