Mark 12:31
And the second is like, namely this, Thou shalt love thy neighbour as thyself. There is none other commandment greater than these.
Cross-reference
1 John 4:21 explicitly ties love for God to love for brother — it directly echoes the command here, showing its inseparable link.
In 1 John 4:8, God is defined as love — this reveals the divine source and nature behind the command to love one's neighbor.
In James 2:8-13, James cites this command as the 'royal law' and warns against favoritism.
In Galatians 5:14, Paul directly quotes this command, stating it fulfills the entire law.
In Romans 13:9, Paul directly quotes this commandment as a summary of the moral law.
In Luke 10:37, Jesus commands to imitate the Samaritan's mercy, the practical meaning of this law.
In Luke 10:36, Jesus uses the parable to define 'neighbor' practically, illustrating the command.
In Luke 10:27, a lawyer quotes this same command to test Jesus, leading to the Good Samaritan parable.
Matthew 22:39 records the same second great commandment in the parallel Gospel account of this conversation.
Matthew 19:19 explicitly includes the command 'love your neighbor as yourself' — the same one quoted here.
Matthew 7:12's Golden Rule sums up the Law — a practical expression of loving your neighbor as yourself.
Leviticus 19:18 is the original source Jesus quotes — the command to love neighbor as self comes directly from the OT law.
Matthew 5:43 records Jesus' contrast: the old tradition added 'hate your enemy' — but here the pure command is given without that addition.
In 1 Corinthians 13:4-8, Paul describes love's character, which is the full expression of this command.
In 1 John 3:17-19, John applies this command by exhorting practical love for those in need.
In 1 John 4:7-8, John calls believers to love one another, grounding it in God's nature as love.