'Accuser' in the Bible

"Should the one who is fighting the Almighty find fault with him? Let God's accuser answer."

Appoint an evil person over him; may an accuser stand at his right side.

May this be the way the LORD repays my accuser, those who speak evil against me.

Do not suppose that I will be the one to accuse you before the Father. Your accuser is Moses, on whom you have set your hope,