2 John 1:1
The elder unto the elect lady and her children, whom I love in the truth; and not I only, but also all they that have known the truth;
Cross-reference
In 2 John 1:2, the abiding truth is the reason for the love mentioned in verse 1.
1 John 2:21, by the same author, affirms readers know truth and no lie is from it, directly reinforcing John's greeting.
In 1 John 3:18, love in deed and truth echoes the same phrase 'love in truth' from 2 John.
In 3 John 1:1, the same author uses identical phrasing 'the elder' and 'whom I love in truth', showing a consistent greeting.
Romans 16:13 calls Rufus 'chosen in the Lord'; 2 John 1:1 addresses the 'chosen lady' – same Greek word for elect.
In 1 Peter 5:1, Peter calls himself a fellow elder, paralleling John's self-designation as 'the elder' here.
1 Timothy 5:1 advises on how to treat an older man; 2 John 1:1's author is 'the elder' – same Greek word presbyteros.