1 Tim 4:1-2. Now the Spirit speaketh expressly, that in the latter times some shall depart from the faith, giving heed to seducing spirits, and doctrines of devils; Speaking lies in hypocrisy; having their conscience seared with a hot iron;
2Pe 1-3. But there were false prophets among the people, as there will be false teachers among you, who will secretly put forward wrong teachings for your destruction, even turning away from the Lord who gave himself for them; whose destruction will come quickly, and they themselves will be the cause of it. And a great number will go with them in their evil ways, through whom the true way will have a bad name. And in their desire for profit they will come to you with words of deceit, like traders doing business in souls: whose punishment has been ready for a long time and their destruction is watching for them.
Mat 24:4-5 And Jesus answered and said unto them, Take heed that no man deceive you. For many shall come in my name, saying, I am Christ; and shall deceive many. V24. 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.
Mat 7:15. Beware of false prophets, which come to you in sheep’s clothing, but inwardly they are ravening wolves.