1 John 2:18-19

It is the last time. We are in the last dispensation.

Antichrist shall come. False Christs and those opposed to Christ.

See PNT Mt 24:4. Anti-Christ is Anti-Christianity.

Whereby we know that it is the last time. Their appearance is a part of the series of events which leads to the final consummation.
They went out from us, but they were not of us. This implies that these antichrists were apostates. The worst men are often those who were once outwardly religious and have fallen away.

For if they had been of us, they would [no doubt] have continued with us. Had they been true and genuine Christians they could hardly have fallen into such a state of enmity. Their going away and bitter opposition show that they were not real converts.
Copyright information for PNT