Children, it is the last hour. And as you have heard, "Antichrist is coming," even now many antichrists have come. We know from this that it is the last hour.
References for 1 John 2:18
They went out from us, but they did not belong to us; for if they had belonged to us, they would have remained with us. However, they went out so that it might be made clear that none of them belongs to us.
But you have an anointing from the Holy One, and you all have knowledge.
References for 1 John 2:20
I have not written to you because you don't know the truth, but because you do know it, and because no lie comes from the truth.
Who is the liar, if not the one who denies that Jesus is the Messiah? He is the antichrist, the one who denies the Father and the Son.
No one who denies the Son can have the Father; he who confesses the Son has the Father as well.
What you have heard from the beginning must remain in you. If what you have heard from the beginning remains in you, then you will remain in the Son and in the Father.
References for 1 John 2:24
And this is the promise that He Himself made to us: eternal life.
I have written these things to you about those who are trying to deceive you.
The anointing you received from Him remains in you, and you don't need anyone to teach you. Instead, His anointing teaches you about all things, and is true and is not a lie; just as it has taught you, remain in Him.
So now, little children, remain in Him, so that when He appears we may have boldness and not be ashamed before Him at His coming.
References for 1 John 2:28