2 Bible Verses about Testing Spirits

Beloved, do not believe every spirit, but try the spirits, whether they be from God; because many false prophets are gone forth into the world.

By this you know the Spirit of God: Every spirit that confesses Jesus Christ has come in the flesh, is from God. And every spirit that does not confess Jesus, is not from God: and this is that spirit of antichrist, which you have heard that it comes, and now is in the world already. You are of God, little children, and have overcome them; because he is greater, who is with you, than he who is with the world.read more.
They are of the world; therefore they speak from the world, and the world hearkens to them. We are of God: he who know God, hearkens to us; he who is not of God, hearkens not to us. By this we know the spirit of truth, and the spirit of error.