1 John 2:21 KJV
I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.
1 John 2:19–23 KJV Chapter Context
19
They went out from us, but they were not of us; for if they had been of us, they would no doubt have continued with us: but they went out, that they might be made manifest that they were not all of us.
20
But ye have an unction from the Holy One, and ye know all things.
21
I have not written unto you because ye know not the truth, but because ye know it, and that no lie is of the truth.
22
Who is a liar but he that denieth that Jesus is the Christ? He is antichrist, that denieth the Father and the Son.
23
Whosoever denieth the Son, the same hath not the Father: [but] he that acknowledgeth the Son hath the Father also.