Original Verse:
1st John Chapter 4 Verse 1Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.

Reference Verses:
2nd John Chapter 1 Verse 7For many deceivers are entered into the world, who confess not that Jesus Christ is come in the flesh. This is a deceiver and an antichrist.
2nd Peter Chapter 2 Verse 1But there were false prophets also among the people, even as there shall be false teachers among you, who privily shall bring in damnable heresies, even denying the Lord that bought them, and bring upon themselves swift destruction.
Revelation Chapter 2 Verse 2I know thy works, and thy labour, and thy patience, and how thou canst not bear them which are evil: and thou hast tried them which say they are apostles, and are not, and hast found them liars:
Luke Chapter 21 Verse 8And he said, Take heed that ye be not deceived: for many shall come in my name, saying, I am Christ; and the time draweth near: go ye not therefore after them.
Matthew Chapter 24 Verse 23Then if any man shall say unto you, Lo, here is Christ, or there; believe it not.
Mark Chapter 13 Verse 21And then if any man shall say to you, Lo, here is Christ; or, lo, he is there; believe him not:
Deuteronomy Chapter 13 Verse 1-5 [1] If there arise among you a prophet, or a dreamer of dreams, and giveth thee a sign or a wonder, [2] 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; [3] Thou shalt not hearken unto the words of that prophet, or that dreamer of dreams: for the LORD your God proveth you, to know whether ye love the LORD your God with all your heart and with all your soul. [4] Ye shall walk after the LORD your God, and fear him, and keep his commandments, and obey his voice, and ye shall serve him, and cleave unto him. [5] And that prophet, or that dreamer of dreams, shall be put to death; because he hath spoken to turn you away from the LORD your God, which brought you out of the land of Egypt, and redeemed you out of the house of bondage, to thrust thee out of the way which the LORD thy God commanded thee to walk in. So shalt thou put the evil away from the midst of thee.
Jeremiah Chapter 5 Verse 31The prophets prophesy falsely, and the priests bear rule by their means; and my people love to have it so: and what will ye do in the end thereof?
Jeremiah Chapter 29 Verse 8For thus saith the LORD of hosts, the God of Israel; Let not your prophets and your diviners, that be in the midst of you, deceive you, neither hearken to your dreams which ye cause to be dreamed.
Jeremiah Chapter 29 Verse 9For they prophesy falsely unto you in my name: I have not sent them, saith the LORD.
Matthew Chapter 24 Verse 5For many shall come in my name, saying, I am Christ; and shall deceive many.
Romans Chapter 16 Verse 18For they that are such serve not our Lord Jesus Christ, but their own belly; and by good words and fair speeches deceive the hearts of the simple.
Romans Chapter 16 Verse 19For your obedience is come abroad unto all men. I am glad therefore on your behalf: but yet I would have you wise unto that which is good, and simple concerning evil.
Proverbs Chapter 14 Verse 15The simple believeth every word: but the prudent man looketh well to his going.
Matthew Chapter 24 Verse 4And Jesus answered and said unto them, Take heed that no man deceive you.
Luke Chapter 12 Verse 57Yea, and why even of yourselves judge ye not what is right?
Acts Chapter 17 Verse 11These were more noble than those in Thessalonica, in that they received the word with all readiness of mind, and searched the scriptures daily, whether those things were so.
1st Corinthians Chapter 14 Verse 29Let the prophets speak two or three, and let the other judge.
Matthew Chapter 7 Verse 15Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
Acts Chapter 20 Verse 29For I know this, that after my departing shall grievous wolves enter in among you, not sparing the flock.
Matthew Chapter 7 Verse 16Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
1st Thessalonians Chapter 5 Verse 21Prove all things; hold fast that which is good.
1st Timothy Chapter 4 Verse 1Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils;
2nd Timothy Chapter 3 Verse 13But evil men and seducers shall wax worse and worse, deceiving, and being deceived.
1st John Chapter 2 Verse 18Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby we know that it is the last time.
Matthew Chapter 24 Verse 24For there shall arise false Christs, and false prophets, and shall shew great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
Jude Chapter 1 Verse 4For there are certain men crept in unawares, who were before of old ordained to this condemnation, ungodly men, turning the grace of our God into lasciviousness, and denying the only Lord God, and our Lord Jesus Christ.