Bible Verses About False Prophets: Mode of trying and detecting

If there arise in the midst of thee a prophet, or a dreamer of dreams, and he give 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 thy heart, How shall we know the word which Jehovah hath not spoken?

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

Beloved, believe not every spirit, but prove 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 Jesus is not of God: and this is the spirit of the antichrist, whereof ye have heard that it cometh; and now it is in the world already.