Christ's warning about, and to, false prophets:
"7:15 Beware of false prophets, which come to you in sheep's clothing, but inwardly they are ravening wolves. 7:16 Ye shall know them by their fruits. Do men gather grapes of thorns, or figs of thistles? 7:17 Even so every good tree bringeth forth good fruit; but a corrupt tree bringeth forth evil fruit. 7:18 A good tree cannot bring forth evil fruit, neither can a corrupt tree bring forth good fruit. 7:19 Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. 7:20 Wherefore by their fruits ye shall know them" (Matthew 7:15-20 KJV).
"Your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour"
False prophets are frequently compared to wild animals that prey upon domestic animals. In the quote above, Christ compared them to "wolves." Other verses describe them as "foxes" or "jackals, perhaps as an analogy of Satan himself who is compared to a "roaring lion": "5:8 Be sober, be vigilant; because your adversary the devil, as a roaring lion, walketh about, seeking whom he may devour" (1 Peter 5:8 KJV). The only difference is that Satan knows that he's a deceiver, while, most often, false prophets are as deceived as those that they deceive.
"13:1 And the word of the LORD came unto me, saying, 13:2 Son of man, prophesy against the prophets of Israel that prophesy, and say thou unto them that prophesy out of their own hearts, Hear ye the word of the LORD; 13:3 Thus saith the Lord GOD; Woe unto the foolish prophets, that follow their own spirit, and have seen nothing! 13:4 O Israel, thy prophets are like the foxes in the deserts. 13:5 Ye have not gone up into the gaps, neither made up the hedge for the house of Israel to stand in the battle in the day of the LORD. 13:6 They have seen vanity and lying divination, saying, The LORD saith: and the LORD hath not sent them: and they have made others to hope that they would confirm the word [see also False Christs and Anti-Christs]. 13:7 Have ye not seen a vain vision, and have ye not spoken a lying divination, whereas ye say, The LORD saith it; albeit I have not spoken?
13:8 Therefore thus saith the Lord GOD; Because ye have spoken vanity, and seen lies, therefore, behold, I am against you, saith the Lord GOD. 13:9 And mine hand shall be upon the prophets that see vanity, and that divine lies: they shall not be in the assembly of my people, neither shall they be written in the writing of the house of Israel, neither shall they enter into the land of Israel; and ye shall know that I am the Lord GOD.
13:10 Because, even because they have seduced my people, saying, Peace; and there was no peace; and one built up a wall, and, lo, others daubed it with untempered mortar: 13:11 Say unto them which daub it with untempered mortar, that it shall fall: there shall be an overflowing shower; and ye, O great hailstones, shall fall; and a stormy wind shall rend it. 13:12 Lo, when the wall is fallen, shall it not be said unto you, Where is the daubing wherewith ye have daubed it?
13:13 Therefore thus saith the Lord GOD; I will even rend it with a stormy wind in my fury; and there shall be an overflowing shower in mine anger, and great hailstones in my fury to consume it.
13:14 So will I break down the wall that ye have daubed with untempered mortar, and bring it down to the ground, so that the foundation thereof shall be discovered, and it shall fall, and ye shall be consumed in the midst thereof: and ye shall know that I am the LORD. 13:15 Thus will I accomplish my wrath upon the wall, and upon them that have daubed it with untempered mortar, and will say unto you, The wall is no more, neither they that daubed it; 13:16 To wit, the prophets of Israel which prophesy concerning Jerusalem, and which see visions of peace for her, and there is no peace, saith the Lord GOD.
13:17 Likewise, thou son of man, set thy face against the daughters of thy people, which prophesy out of their own heart; and prophesy thou against them, 13:18 And say, Thus saith the Lord GOD; Woe to the women that sew pillows to all armholes, and make kerchiefs upon the head of every stature to hunt souls! Will ye hunt the souls of my people, and will ye save the souls alive that come unto you?
13:20 Wherefore thus saith the Lord GOD; Behold, I am against your pillows, wherewith ye there hunt the souls to make them fly, and I will tear them from your arms, and will let the souls go, even the souls that ye hunt to make them fly. 13:21 Your kerchiefs also will I tear, and deliver my people out of your hand, and they shall be no more in your hand to be hunted; and ye shall know that I am the LORD. 13:22 Because with lies ye have made the heart of the righteous sad, whom I have not made sad; and strengthened the hands of the wicked, that he should not return from his wicked way, by promising him life: 13:23 Therefore ye shall see no more vanity, nor divine divinations: for I will deliver my people out of your hand: and ye shall know that I am the LORD." (Ezekiel 13:1-23 KJV)
Fact Finder: How does Christ protect His "sheep" from predators?
See The Shepherd's Fold and The Shepherd's Voice