Fighting the Antichrists

Little sons, it is the last hour. And, as you have heard that the Antichrist is coming, so now many antichrists have arrived. By this, we know that it is the last hour. They went out from among us, but they were not of us. For, if they had been of us, certainly they would have remained with us. But in this way, it is made manifest that none of them are of us. Yet you have the anointing of the Holy One, and you know everything. I have not written to you as to ones who are ignorant of the truth, but as to ones who know the truth. For no lie is of the truth. Who is a liar, other than he who denies that Jesus is the Christ? This one is the Antichrist, who denies the Father and the Son.
1 John 2:18-22