1 John 2:18-19
18Children, ait is the last hour; and just as you heard that bantichrist is coming, ceven now many antichrists have appeared. From this we know that it is the last hour. 19aThey went out from us, but they were not really of us; for if they were of us, they would have remained with us; but they went out, bso that 1it would be manifested that they all are not of us.