2Thes 2:1-3. Now as to the coming of the Lord Jesus Christ, and our meeting with him, it is our desire, my brothers, That you may not be moved in mind or troubled by a spirit, or by a word, or by a letter as from us, with the suggestion that the day of the Lord is even now come; Give no belief to false words: because there will first be a falling away from the faith, and the revelation of the man of sin, the son of destruction,
Mat 24:3-4. And Jesus said to them in answer, Take care that you are not tricked. For people will come in my name, saying, I am the Christ; and a number will be turned from the true way through them. V24. For there will come up false Christs, and false prophets, who will do great signs and wonders; so that if possible even the elects might be tricked.
2Co 11:13-14. For such men are false Apostles, workers of deceit, making themselves seem like Apostles of Christ. And it is no wonder; for even Satan himself is able to take the form of an angel of light. So it is no great thing if his servants make themselves seem to be servants of righteousness; whose end will be the reward of their works.