In the book of the First Epistle of John Chapter 2 verses 18-23

18) Children, it is the final hour; just as you heard that the Antichrist was coming, so now many such Antichrists have appeared. This makes us certain that it is the final hour.

19) It was from our ranks that they took their leave-not that they really belonged to us; for if they had belonged to us, they would have stayed with us. It only served to show that none of them was ours.

20) But you have the anointing that comes from the Holy One, so that all knowledge is yours.

21) My reason for having written you is not that you do not know the truth but that you do, and that no lie has anything in common with the truth.

22) Who is the liar? He who denies that Jesus is the Christ. He is the antichrist, denying the Father and the Son.

23) Anyone who denies the Son has no claim on the Father, but he who acknowledges the Son can claim the Father as well.