The First Epistle of John is a letter found in the New Testament of the Christian Bible, traditionally attributed to the Apostle John. It addresses early Christian communities, emphasizing the importance of love, faith, and the nature of God. The letter reassures believers of their salvation and encourages them to live in accordance with God's commandments. In this epistle, John contrasts light and darkness, truth and falsehood, urging readers to remain steadfast in their beliefs. It also warns against false teachings and emphasizes the significance of loving one another as a reflection of God's love. The letter serves as both a guide and a source of encouragement for Christians.