1 Kings 2:5
Moreover thou knowest also what Joab the son of Zeruiah did to me, and what he did to the two captains of the hosts of Israel, unto Abner the son of Ner, and unto Amasa the son of Jether, whom he slew, and shed the blood of war in peace, and put the blood of war upon his girdle that was about his loins, and in his shoes that were on his feet.
Cross-references
1 Kings 2:31 records Solomon executing Joab as commanded — fulfilling David's instructions to remove innocent blood from his house.
1 Kings 2:32 directly echoes the same murders of Abner and Amasa, declaring divine retribution on Joab for their blood.
1 Kings 1:7 shows Joab supporting Adonijah, providing the background for David's command about Joab's past crimes.
1 Kings 1:19 directly names Joab among those invited to Adonijah's feast, confirming his participation in the conspiracy.
2 Samuel 3:27 gives the detailed account of Joab murdering Abner — the very event David references in his charge.
In 2 Samuel 3:39, David complains that the sons of Zeruiah (including Joab) are too harsh, grounding the later charge about Joab's violence.
2 Samuel 18:14 records Joab killing Absalom against David's orders — another example of his unauthorized bloodshed, reinforcing his violent character.
2 Samuel 20:10 narrates Joab's treacherous killing of Amasa — the second murder David recalls and the basis for his instruction.
Genesis 9:6 establishes the divine principle that bloodshed demands blood — the theological basis for David's call to execute Joab here.
Numbers 35:20 defines murder as killing out of hatred or ambush — exactly how Joab killed Abner and Amasa, confirming his guilt.
Deuteronomy 19:12 commands delivering a murderer to the avenger of blood — the judicial action Solomon must take against Joab.
Matthew 5:21 cites the commandment against murder, which Joab explicitly violated by killing Abner and Amasa in peacetime.
2 Samuel 17:25 identifies Amasa as Joab's relative and Absalom's general — background explaining Amasa's significance and Joab's motive.
1 Chronicles 2:17 identifies Amasa's parentage — providing background on one of the victims Joab murdered.