1 John 2:18-21

18 Little children, it is the last time: and as ye have heard that antichrist cometh, even now are there many antichrists; by which we know that it is the last time.

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 to you because ye know not the truth, but because ye know it, and that no lie is of the truth.