"see booker the first century christians printed the day of the Lord was here in a letter" so he asked me the question were they false prophets? "
It was not apostle Pauls mistake, it was the flock who had mistaken Pauls meaning. Big difference!
From these words it appears that some among the Thessalonians had mistaken the apostle's meaning, in what he had written in his former epistle about the coming of Christ, by thinking that it was near at hand,--that Christ was just ready to appear and come to judgment. Or, it may be, some among them pretended that they had the knowledge of this by particular revelation from the Spirit, or from some words they had heard from the apostle, when he was with them, or some letter he had written or they pretended he had written to them or some other person: and hereupon the apostle is careful to rectify this mistake, and to prevent the spreading of this error.
~Jer. 23:32-36 “Behold, I am against those who prophesy false dreams,” says the LORD, “and tell them, and cause My people to err by their lies and by their recklessness. Yet I did not send them or command them; therefore they shall not profit this people at all,” says the LORD. “So when these people or the prophet or the priest ask you, saying, ‘What is the oracle of the LORD?’ you shall then say to them, ‘What oracle?’ I will even forsake you,” says the LORD. “And as for the prophet and the priest and the people who say, ‘The oracle of the LORD!’ I will even punish that man and his house. “Thus every one of you shall say to his neighbor, and every one to his brother, ‘What has the LORD answered?’ and, ‘What has the LORD spoken?’”And the oracle of the LORD you shall mention no more.For every man’s word will be his oracle, for you have perverted the words of the living God, the LORD of hosts, our God.”
~Jer. 8:8-11 “How can you say, ‘We are wise, and the law of the LORD is with us’? Look, the false pen of the scribe certainly works falsehood. The wise men are ashamed, they are dismayed and taken. Behold, they have rejected the word of the LORD; so what wisdom do they have? Therefore I will give their wives to others, and their fields to those who will inherit them; because from the least even to the greatest everyone is given to covetousness; from the prophet even to the priest everyone deals falsely. For they have healed the hurt of the daughter of My people slightly, saying, ‘Peace, peace!’ When there is no peace.”
~I am the Lord, who has made all things, who alone stretched out the heavens, who spread out the earth by myself, who foils the signs of false prophets ... who carries out the words of his servants and fulfills the predictions of his messengers” (Isaiah 44:24-26)
~ Deut. 13:3-5 “ you shall not listen to the words of that prophe t or that dreamer of dreams, for the LORD your God is testing you to know whether you love the LORD your God with all your heart and with all your soul.
~Who say to the seers, “Do not see,” and to the prophets, “Do not prophesy to us right things; speak to us smooth things, prophesy deceits” (Isa.30:9-10)
NIV 2 Thess 2:1-3 ***
Concerning the coming of our Lord Jesus Christ and our being gathered to him, we ask you, brothers and sisters, 2 not to become easily unsettled or alarmed by the teaching allegedly from us—whether by a prophecy or by word of mouth or by letter—asserting that the day of the Lord has already come. 3 Don’t let anyone deceive you in any way, for that day will not come until the rebellion occurs and the man of lawlessness [a] is revealed, the man doomed to destruction.