2 John 1:5-6 → Leviticus 19:18

John's command to "love one another" stands in direct continuity with the dual love commands of the Old Testament—love God (Deuteronomy 6:5, the Shema) and love neighbor (Leviticus 19:18). Jesus identified these as the greatest commandments (Matthew 22:37-40), and John applies them to the Christian community. The hermeneutical significance lies in John's insistence that this is not a "new commandment" (despite Jesus calling it "new" in John 13:34)—meaning it has always been God's requirement from the beginning of redemptive history. What is new is the Christological grounding and eschatological context: believers love because God first loved them in Christ (1 John 4:19), and they love "as Christ loved us" (Ephesians 5:2). John's linkage of love with commandment-keeping (verse 6) echoes Deuteronomy 10:12-13, where love for God is inseparable from obedience to His commands. This demonstrates that Old Testament covenant ethics—love expressed through obedience—continue in the New Covenant, now mediated through Christ and empowered by the Spirit. The apostolic emphasis on mutual love as the hallmark of the believing community fulfills the Old Testament vision of a people defined by covenant love (Deuteronomy 7:6-9).