2 Samuel 3:26
And when Joab was come out from David, he sent messengers after Abner, which brought him again from the well of Sirah: but David knew it not.
Cross-reference
Proverbs 26:23–26
Related theme
Proverbs 26:23-26 describes hidden hatred and deceitful lips — exactly the kind of secret treachery Joab shows here.
Proverbs 27:4–6
Related theme
Proverbs 27:4-6 contrasts open rebuke with hidden enmity — Joab's secret plot against Abner exemplifies that hidden 'love' is worse.
1 Kings 2:32
Historical context
In 1 Kings 2:32, Solomon refers back to this event, saying Joab struck Abner down to avenge blood, framing it as a righteous judgment.