'Accuser' in the Bible

Come to terms quickly [at the earliest opportunity] with your opponent at law while you are with him on the way [to court], so that your opponent does not hand you over to the judge, and the judge to the guard, and you are thrown into prison.

For while you are going with your opponent [at law] to appear before a magistrate, on the way make an effort to settle, so that he does not drag you before the judge, and the judge does not [rule against you and] turn you over to the officer, and the officer does not throw you into prison.

Jesus answered them, “Did I not choose you, the twelve [disciples]? And yet one of you is a devil (ally of Satan).”

Then I heard a loud voice in heaven, saying,“Now the salvation, and the power, and the kingdom (dominion, reign) of our God, and the authority of His Christ have come; for the accuser of our [believing] brothers and sisters has been thrown down [at last], he who accuses them and keeps bringing charges [of sinful behavior] against them before our God day and night.