Mat 24:24 For there shall arise false Christs, and false prophets, and shall show great signs and wonders; insomuch that, if it were possible, they shall deceive the very elect.
2 Tim 4:3 For the time will come when men will not put up with sound doctrine. Instead, to suit their own desires, they will gather around them a great number of teachers to say what their itching ears want to hear.
2 Tim 4:4 They will turn their ears away from the truth and turn aside to myths.
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.
2 Pet 2:1 [NIV] But there were also false prophets among the people, just as there will be false teachers among you. They will secretly introduce destructive heresies, even denying the sovereign Lord who bought them--bringing swift destruction on themselves.
2 Pet 2:2 [NIV] Many will follow their shameful ways and will bring the way of truth into disrepute.
2 Pet 2:3 [NIV] In their greed these teachers will exploit you with stories they have made up. Their condemnation has long been hanging over them, and their destruction has not been sleeping.
13 Enter ye in at the strait gate: for wide is the gate, and broad is the way, that leadeth to destruction, and many there be which go in thereat:
14 Because strait is the gate, and narrow is the way, which leadeth unto life, and few there be that find it.
15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves.
16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles?
17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit.
18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit.
19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire.
20 Wherefore by their fruits ye shall know them.
21 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.
22 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?
23 And then will I profess unto them, I never knew you: depart from me, ye that work iniquity.
Matthew 7 (and there are many other scriptures) is an earth-shattering wake-up call for prayerful Bible discernment. If we, as Christians do not shine the exposing light of the Word of God upon preachers, Christians or anyone and everyone, how can we possibly obey the clear admonition of our Lord and Saviour in Matthew 7:15? How can we "Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves"— if we do not "judge" who are the "false prophets"? How in the world can we even KNOW who are these "false prophets"? They appear as "sheep" or saved people, but they are "ravening wolves." There is only one way—the unchangeable, perfect Word of God.