1 John 4:21 grounds this obligation in a direct commandment: loving God requires loving brother, making the duty explicit.

1 John 3:16 states Christ laid down his life for us, commanding us to do the same—identical logic to loving because God loved.

1 John 3:17 gives a concrete test of love by helping a brother in need—applying the call to love one another practically.

1 John 2:8 reminds that the command to love one another is a new commandment, rooted in Christ and the coming light.

1 John 3:23 commands both belief in Jesus and love for one another—reinforcing the love command while adding faith.

2 Corinthians 8:9 gives Christ's self-emptying as the paradigm of grace, echoing 'God so loved us' and providing the model for our love.

Colossians 3:13 commands forgiveness 'as the Lord has forgiven you', applying the same 'as' pattern to a specific expression of love.

Ephesians 5:2 says 'walk in love, as Christ loved us and gave himself up', directly paralleling the sacrificial pattern.

Ephesians 4:32 commands kindness and forgiveness 'as God in Christ forgave you', mirroring the 'as God loved us' logic.

John 15:13 defines Christ's love as laying down his life, specifying the sacrificial measure behind 'God so loved us'.

John 15:12 records Jesus' command to love one another as he loved us, directly grounding the obligation in Christ's own teaching.

John 13:34 commands love one another as Christ loved you—the very same principle as loving because God first loved us.

Matthew 18:33 asks 'should you not have mercy as I had mercy?'—exact parallel to 'if God loved us, we should love one another'.

1 Corinthians 13:4 defines love's attributes (patience, kindness) that characterize the love we are to show one another.

Romans 12:10 expands this love command with brotherly affection and honoring others, showing practical outworking.

Deuteronomy 24:22 grounds ethical obligation in God's redemptive act—same logic as 'because God loved us, we must love others.'

Luke 10:37 ends with 'go and do likewise' after the Samaritan shows mercy—similar call to imitate the mercy received.

Matthew 18:32 shows the master forgiving the servant—illustrating the pattern of receiving grace then expected to extend it.