Most Relevant Verses
Yahweh said to him, 'How?' He said, 'I will go out and will be a lying spirit in the mouth of all his prophets.' He said, 'You will entice him, and will also prevail. Go out and do so.'
and to another workings of miracles; and to another prophecy; and to another discerning of spirits; to another different kinds of languages; and to another the interpretation of languages.
For if he who comes preaches another Jesus, whom we did not preach, or if you receive a different spirit, which you did not receive, or a different "good news", which you did not accept, you put up with that well enough.
Beloved, don't believe every spirit, but test the spirits, whether they are of God, because many false prophets have gone out into the world.
By this you know the Spirit of God: every spirit who confesses that Jesus Christ has come in the flesh is of God,
and every spirit who doesn't confess that Jesus Christ has come in the flesh is not of God, and this is the spirit of the Antichrist, of whom you have heard that it comes. Now it is in the world already.
I saw coming out of the mouth of the dragon, and out of the mouth of the beast, and out of the mouth of the false prophet, three unclean spirits, something like frogs;
for they are spirits of demons, performing signs; which go forth to the kings of the whole inhabited earth, to gather them together for the war of that great day of God, the Almighty.