1 John 2:24 urges letting 'what you heard from the beginning' abide in you, directly echoing John's phrase 'the word you have heard from the beginning' in 2:7.

1 John 3:11 specifies the old commandment as loving one another — clarifying what John calls 'old'.

Leviticus 19:18 is the OT love command John calls 'old' — the foundation for his teaching.

Matthew 22:37-40 summarizes the law with love for God and neighbor — the same 'old commandment' John mentions.

Mark 12:29-31 records Jesus' summary of the law as love for God and neighbor — echoing the old commandment.

In Romans 13:8-10, Paul affirms that love fulfills the law, reinforcing John's 'old commandment' as the essence of the entire law.

Galatians 5:13 calls believers to serve one another in love, echoing John's old commandment of love as the basis for Christian freedom.

Galatians 5:14 states the whole law is fulfilled in loving your neighbor, directly paralleling John's old commandment of love.

James 2:8-12 calls the love command the 'royal law' and warns against partiality, amplifying John's old commandment as central to the law.

2 John 1:5 echoes the same phrase about an old commandment from the beginning — reinforcing John's point.

John 15:12 records Jesus' new commandment to 'love one another as I have loved you,' which John later calls both old and new in 1 John 2:7-8.

Matthew 5:43 cites a corrupted version of the love command — contrasting with the true old commandment John affirms.

Leviticus 19:34 expands the love command to include foreigners — the same old commandment John references.