1 John 4:11 grounds the command in God's prior love for us, providing the motivation for loving one another as commanded here.

1 John 4:7 immediately precedes this verse, calling believers to love one another as coming from God.

1 John 3:23 pairs love for one another with faith in Christ as the core commandment, placing this command in a broader context.

1 John 3:18 specifies that this love must be in deed and truth, not just words, adding practical depth to the command.

1 John 3:14 uses love for brothers as evidence of passing from death to life, showing that obeying this command confirms salvation.

1 John 5:1 says that loving the Father implies loving His children, directly supporting the command to love the brother.

1 John 3:10 states that not loving one's brother shows one is not of God, reinforcing the same command.

1 John 2:8 refers to the same new commandment to love one another, which is the basis for the command here.

1 John 3:11 identifies love for one another as the message from the beginning, linking this command to the earliest apostolic tradition.

Leviticus 19:18 is the OT command to love your neighbor, providing the original source and foundation for the love command here.

1 Peter 4:8 urges earnest love that covers sins — showing the depth and effect of the brotherly love commanded here.

1 Peter 3:8 lists brotherly love alongside unity and humility — expanding on how love for brothers should be expressed.

1 Thessalonians 4:9 emphasizes that brotherly love is divinely taught — echoing the command here as something God Himself instructs believers.

Romans 13:10 states love does no harm and fulfills the law, connecting love of neighbor directly to obedience.

Romans 13:9 sums up the law as 'love your neighbor as yourself,' the same principle commanding love for others.

Romans 12:10 urges devotion and honor among believers, directly showing how to love one another practically.

John 15:12 repeats Jesus' command to love each other as He loved, the same foundational teaching echoed here.

John 13:35 says loving one another identifies us as Jesus' disciples, reinforcing the outward evidence of this command.

John 13:34 gives Jesus' new command to love one another as He loved, directly parallel to the command here.

Mark 12:29-33 also presents the dual love command, reinforcing the same structure of loving God and neighbor as in this verse.

Matthew 22:37-39 records Jesus' summary of the law as love for God and neighbor, directly paralleling the dual command here.

Hebrews 13:1 commands 'let brotherly love continue' — a direct parallel to the love for brother commanded here.

1 Peter 1:22 urges sincere brotherly love from a pure heart, directly paralleling the command to love the brother here.

Matthew 5:22 warns against anger toward a brother — illustrating the serious standard behind the command to love brothers.

Mark 12:31 commands love for neighbor as self — the foundational commandment that 1 John 4:21 applies specifically to fellow believers.

Matthew 25:40 identifies serving the least of Christ's brothers as serving Christ — directly connecting love for brothers to love for God.

Genesis 13:8 shows Abram urging peace with Lot citing their brotherhood — an OT example of the love command in action.

Proverbs 14:31 links treatment of the poor to honoring God — a parallel principle that loving God involves loving others.

2 Peter 1:7 lists brotherly affection and love as virtues, echoing the command to love the brother here.

Romans 12:9 calls for sincere love without hypocrisy, adding a quality requirement to the command to love brothers.

In Ephesians 1:15, Paul commends love toward all saints, echoing the command to love the brother here.