There are many references to false prophets in the bible.. If you have not read the bible then I suggest that you do that how else can you know what God wants you to know. How to discern false prophets is actually pretty simple..
Matthew 7:15-23 "Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. Wherefore by their fruits ye shall know them. Not every one that saith unto me, Lord, Lord, shall enter into the kingdom of heaven; but he that doeth the will of my Father which is in heaven. Many will say to me in that day, Lord, Lord, have we not prophesied in thy name? and in thy name have cast out devils? and in thy name done many wonderful works? And then will I profess unto them, I never knew you: depart from me, ye that work iniquity."
All true Christians are in agreement that our standard is the Word of God, the Bible. God left us this Book as a reference, standard, or gauge so we could know whether something is good or evil, truth or error, right or wrong. (2 Timothy 3:16-17: "All scripture is given by inspiration of God, and is profitable for doctrine, for reproof, for correction, for instruction in righteousness: That the man of God may be perfect, thoroughly furnished unto all good works.'')
The Lord said in verse 20 of Matthew 7 that we would know them by their fruits. What are these fruits? Galatians 5:22-24 defines them as being the fruit of the Spirit. "But the fruit of the Spirit is love, joy, peace, longsuffering, gentleness, goodness, faith, meekness, temperance: against such there is no law. And they that are Christ's have crucified the flesh with the affections and lusts." We are told to look at their lives and see if these fruits are predominant in them and examine if they are living the crucified life. Of course, we must allow for imperfections that have not been overcome yet; but we should readily see the fruit of the Spirit in more abundance than the imperfections. One way we can check this is to notice the words that a man speaks. The Scripture says in Matthew 12:33-35, "Either make the tree good, and his fruit good; or else make the tree corrupt, and his fruit corrupt: for the tree is known by his fruit. O generation of vipers, how can ye, being evil, speak good things? for out of the abundance of the heart the mouth speaketh. A good man out of the good treasure of the heart bringeth forth good things: and an evil man out of the evil treasure bringeth forth evil things.''
Deuteronomy 18:22 when a prophet speaks in the name of the Lord, if the thing does not happen or come to pass, that is the thing which the Lord has not spoken; the prophet has spoken it presumptuously; you shall not be afraid of him.
Hebrews 5:10-14 called by God as High Priest "according to the order of Melchizedek," of whom we have much to say, and hard to explain, since you have become dull of hearing. For though by this time you ought to be teachers, you need someone to teach you again the first principles of the oracles of God; and you have come to need milk and not solid food. For everyone who partakes only of milk is unskilled in the word of righteousness, for he is a babe. But solid food belongs to those who are of full age, that is, those who by reason of use have their senses exercised to discern both good and evil.
1John 2:3-4 Now by this we know that we know Him, if we keep His commandments. He who says, "I know Him," and does not keep His commandments, is a liar, and the truth is not in him.
Romans 16:17 Now I urge you, brethren, note those who cause divisions and offenses, contrary to the doctrine which you learned, and avoid them.
John 10:3-5 To him the doorkeeper opens, and the sheep hear his voice; and he calls his own sheep by name and leads them out. And when he brings out his own sheep, he goes before them; and the sheep follow him, for they know his voice. Yet they will by no means follow a stranger, but will flee from him, for they do not know the voice of strangers."
" I am the Good Shepherd, and know My sheep, and am known of Mine. As the Father knoweth Me, even so know I the Father: and I lay down My life for the sheep... My sheep hear My Voice, and I know them, and they follow Me" (John 10:14-15,27).
"For 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" Matthew 24:24
