In John 17:21, Jesus prays for unity among believers so the world may believe, closely paralleling love as the identifying mark of disciples.

John 15:8 links bearing fruit to being disciples — love here is the fruit that glorifies the Father.

John 17:23 shows unity among believers also testifies to the world — a parallel witness through love.

Acts 4:32-35 shows the early church living in radical unity and sharing, a practical demonstration of the love that identifies disciples.

In 1 John 4:21, the commandment to love one another is explicitly restated, linking back to Jesus' new command in John 13:35.

In 1 John 4:20, love for God is proven by love for fellow believers, reinforcing that mutual love is the test of discipleship.

In 1 John 3:10-14, love for brothers is the evidence of passing from death to life, directly expanding on the love that marks disciples.

In 1 John 2:5, the same 'by this we know' structure ties keeping God's word to perfected love, reinforcing love as the mark of true discipleship.

In 2 John 1:5, this command is called the one from the beginning, reaffirming its foundational importance.

In 1 John 3:14, loving brothers is evidence of passing from death to life, linking love to eternal assurance.

In 1 John 3:11, the same message from the beginning is repeated: love one another, directly echoing Jesus' command.

In 1 Peter 2:17, love for the brotherhood is commanded alongside honoring all, expanding the mark of discipleship to broader conduct.

1 Peter 1:22 connects sincere love to obedience of truth — the same mark of discipleship deepened by purification.

Hebrews 13:1 commands ongoing brotherly love — the very thing that identifies disciples here.

1 Thessalonians 4:9 affirms that God teaches believers to love one another — the same mark of discipleship here.

1 Corinthians 16:14 expands the love command to all actions — not just among disciples but everything.

Romans 12:10 echoes the command to love one another, adding 'honor one another above yourselves' as a practical expression.

In 1 John 2:10, loving a brother is evidence of abiding in the light, echoing that mutual love identifies true disciples.

In 1 John 3:19, love in action assures our hearts before God, connecting the command to inner confidence.

In 1 John 5:2, love for God's children shows we love God and obey him, adding a vertical dimension.

In Luke 6:35, love extends to enemies — broadening the scope of love that marks disciples here.

In 2 Peter 1:7, brotherly affection leads to love, showing love as the culmination of virtues.

1 Thessalonians 5:13 applies love to honoring leaders and living peaceably — a specific outworking of mutual love.

1 Corinthians 1:10 urges unity without divisions — a practical outworking of the love that marks disciples here.