'Accuser' in the Bible
Now there was a day when the sons (the angels) of God came to present themselves before the Lord, and Satan (the adversary and accuser) also came among them.
And the Lord said to Satan (the adversary and the accuser), Behold, all that he has is in your power, only upon the man himself put not forth your hand. So Satan went forth from the presence of the Lord.
Again there was a day when the sons of God [the angels] came to present themselves before the Lord, and Satan (the adversary and the accuser) came also among them to present himself before the Lord.
And the Lord said to Satan, From where do you come? And Satan (the adversary and the accuser) answered the Lord, From going to and fro on the earth and from walking up and down on it.
"If only I had someone to hear me! Here is my signature -- let the Almighty answer me! If only I had an indictment that my accuser had written.
"Should the one who is fighting the Almighty find fault with him? Let God's accuser answer."
Set a wicked person over him; let an accuser stand at his right hand.
May this be the way the LORD repays my accuser, those who speak evil against me.
Sheol (the place of the dead) and Abaddon (the abyss, the final place of the accuser Satan) are both before the Lord -- "how much more, then, the hearts of the children of men?
The one who vindicates me is close by. Who dares to argue with me? Let us confront each other! Who is my accuser? Let him challenge me!
Therefore [earnestly] wait for Me, says the Lord, [waiting] for the day when I rise up to the attack [as a witness, accuser, or judge, and a testimony]. For My decision and determination and right it is to gather the nations together, to assemble the kingdoms, to pour upon them My indignation, even all [the heat of] My fierce anger; for [in that day] all the earth shall be consumed with the fire of My zeal and jealousy.
Reach agreement quickly with your accuser while on the way to court, or he may hand you over to the judge, and the judge hand you over to the warden, and you will be thrown into prison.
As you are going with your accuser before the magistrate, make an effort to settle with him on the way, so that he will not drag you before the judge, and the judge hand you over to the officer, and the officer throw you into prison.
Do not think that I will accuse you to the Father. Your accuser is Moses, on whom you have set your hope.
Jesus answered them, Did I not choose you, the Twelve? And [yet] one of you is a devil (of the evil one and a false accuser).
Curb every passion, and be on the alert. Your great accuser, the Devil, is going about like a roaring lion to see whom he can devour.
And I heard a loud voice saying in heaven, Now is come salvation, and strength, and the kingdom of our God, and the power of his Christ: for the accuser of our brethren is cast down, which accused them before our God day and night.