1 John 2:19-22

For even though they were once a part of us, they withdrew from us because they were never really of our number. For if they had truly belonged to us they would have continued with us. By leaving our community of believers they made it obvious that they never really belonged to us. But the Holy One has anointed you and you all know the truth. So I’m writing to you not because you don’t know the truth, but because you do know it, and no lie belongs to the truth. Who is the real liar but the one who denies that Jesus is the Christ. He is the real antichrist, the one who denies the Father and the Son.