Matthew 7:15 Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves.
Sheep is a description used of genuine Christians.
John 10:11 I am the good shepherd: the good shepherd giveth his life for the sheep.
Wolves in sheep’s clothing are those who appear to be Christians but teach error to ‘devour’ the sheep by making merchandise of them.
2 Peter 2:3 And through covetousness shall they with feigned words make merchandise of you: whose judgment now of a long time lingereth not, and their damnation slumbereth not.
There have always been people who pretend to be prophets. There were false prophets in the Old Testament and we are warned that there will be false prophets amongst Christians.
2 Peter 2:1 But 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.
Matthew 24:11 And many false prophets shall rise, and shall deceive many.
Matthew 24:24 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.
1 John 4:1 Beloved, believe not every spirit, but try the spirits whether they are of God: because many false prophets are gone out into the world.
The motivation of false prophets is generally to make money, but those who believe them will be robbed of their salvation.
Since the end of the first century AD there have been no genuine prophets. Jesus Christ, the Son of God, was the last prophet and the prophecy he gave to John in the Book of Revelation foretells events from that time through to the Kingdom of God.
Hebrews 1:1-2 God, who at sundry times and in divers manners spake in time past unto the fathers by the prophets, 2 Hath in these last days spoken unto us by his Son, whom he hath appointed heir of all things…
Once the New Testament was complete there was no further need for prophets. All that we need to know for salvation is available in written form.
The Gospel is complete.
Galatians 1:8-9 But though we, or an angel from heaven, preach any other gospel unto you than that which we have preached unto you, let him be accursed. 9 As we said before, so say I now again, If any man preach any other gospel unto you than that ye have received, let him be accursed.
The doctrine is complete.
Acts 2:41-42 Then they that gladly received his word were baptized: and the same day there were added unto them about three thousand souls. 42 And they continued stedfastly in the apostles’ doctrine and fellowship, and in breaking of bread, and in prayers.
1 Timothy 1:3 As I besought thee to abide still at Ephesus, when I went into Macedonia, that thou mightest charge some that they teach no other doctrine,
1 Timothy 4:16 Take heed unto thyself, and unto the doctrine; continue in them: for in doing this thou shalt both save thyself, and them that hear thee.
No further revelation is necessary until Christ returns to establish the Kingdom of God.
I hope you find this helpful.