Again. Who do you think John was speaking of that left their group and was spreading falsehoods?
1 John 2
18 Little children, it is the last time: and as ye have heard that antichrist shall come, even now are there many antichrists; whereby 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.
People who never knew Christ who left Christianity and engaged in the behaviors spelled out in the previous post.