Epistle of Barnabas (c.80–c.100)
In this epistle, the church is exhorted to persevere in this evil present time so it can stand firm when it encounters the future Antichrist.
The final stumbling-block (or source of danger) approaches . . . We take earnestheed in these last days; for the whole [past] time of your faith will profit you nothing, unless now in this wicked time we also withstand coming sources of danger, as becometh the sons of God. That the Black One [Antichrist] may find no means of entrance, let us flee from every vanity, let us utterly hate the works of the way of wickedness. Do not, by retiring apart, live a solitary life, as if you were already [fully] justified . . . Take heed, lest resting at our ease, as those who are the called [of God], we should fall asleep in our sins, and the wicked prince, acquiring power over us, should thrust us away from the kingdom of the Lord (Epistle of Barnabas, 4).