What are the signs of Antichrist according to the Bible?

In his epistle, John identifies several characteristics of Antichrist, which serve as indicators for believers. Firstly, Antichrists will go out from the community of faith, suggesting a departure from the true revelation of the gospel. Secondly, they do not belong to the true followers of Christ, evidenced by a lack of genuine faith and regeneration. Thirdly, their actions are permitted by God's providence to purify the church, revealing the true nature of believers amidst false teachings. Finally, John emphasizes that Antichrists deny core truths about Christ, fundamentally undermining the essence of the gospel. These signs are meant to prepare and elucidate for believers the reality of falsehood in their midst.