Bible Verses About False Prophets: Mode of trying and detecting

¶ If there arise among you a prophet, or a dreamer of dreams, and giveth thee a sign or a wonder,

And the sign or the wonder come to pass, whereof he spake unto thee, saying, Let us go after other gods, which thou hast not known, and let us serve them;

And if thou say in thine heart, How shall we know the word which the LORD hath not spoken?

When a prophet speaketh in the name of the LORD, if the thing follow not, nor come to pass, that is the thing which the LORD hath not spoken, but the prophet hath spoken it presumptuously: thou shalt not be afraid of him.

¶ Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.

Hereby know ye the Spirit of God: Every spirit that confesseth that Jesus Christ is come in the flesh is of God:

And every spirit that confesseth not that Jesus Christ is come in the flesh is not of God: and this is that spirit of antichrist, whereof ye have heard that it should come; and even now already is it in the world.