1 John 2:18-19
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18Children, it is the last hour; and just as you heard that antichrist is coming, even now many antichrists have appeared; from this we know that it is the last hour. 19They went out from us, but they were not really of us; for if they had been of us, they would have remained with us; but they went out, so that it would be evident that they all are not of us.