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Internal enemies, however, are not dealt with so easily. Wolves can go about in sheep’s clothing for a long time before they are finally found out. False teachers, because they come in Christ’s name, elicit the trust of their students, and their corrupt doctrine weakens the faith of those who sit under their teaching.

Two words. Andy Stanley.

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One of the most vivid Biblical example of false prophets was what Jeremiah had to deal with. Please keep in mind that Israel was faithless from Jeroboam's time but Judah was unfaithful and that was far worst. (Jer 3:11)

Jer 23:11 "Both prophet and priest are ungodly; even in my house I have found their evil, declares the LORD.
Jer 23:12 Therefore their way shall be to them like slippery paths in the darkness, into which they shall be driven and fall, for I will bring disaster upon them in the year of their punishment, declares the LORD.
Jer 23:13 In the prophets of Samaria I saw an unsavory thing: they prophesied by Baal and led my people Israel astray.
Jer 23:14 But in the prophets of Jerusalem I have seen a horrible thing: they commit adultery and walk in lies; they strengthen the hands of evildoers, so that no one turns from his evil; all of them have become like Sodom to me, and its inhabitants like Gomorrah."
Jer 23:15 Therefore thus says the LORD of hosts concerning the prophets: "Behold, I will feed them with bitter food and give them poisoned water to drink, for from the prophets of Jerusalem ungodliness has gone out into all the land."
Jer 23:16 Thus says the LORD of hosts: "Do not listen to the words of the prophets who prophesy to you, filling you with vain hopes. They speak visions of their own minds, not from the mouth of the LORD.
Jer 23:17 They say continually to those who despise the word of the LORD, 'It shall be well with you'; and to everyone who stubbornly follows his own heart, they say, 'No disaster shall come upon you.'"
Jer 23:18 For who among them has stood in the council of the LORD to see and to hear his word, or who has paid attention to his word and listened?
Jer 23:19 Behold, the storm of the LORD! Wrath has gone forth, a whirling tempest; it will burst upon the head of the wicked.
Jer 23:20 The anger of the LORD will not turn back until he has executed and accomplished the intents of his heart. In the latter days you will understand it clearly.
Jer 23:21 "I did not send the prophets, yet they ran; I did not speak to them, yet they prophesied.
Jer 23:22 But if they had stood in my council, then they would have proclaimed my words to my people, and they would have turned them from their evil way, and from the evil of their deeds.

One has to wonder what God thinks about us today?