1 Kings 2:25
And king Solomon sent by the hand of Benaiah the son of Jehoiada; and he fell upon him that he died.
Cross-reference
1 Kings 2:34 describes Benaiah striking down Joab, identical action and agent as in Adonijah's execution.
1 Kings 2:46 concludes with Benaiah striking down Shimei, using the same formula, establishing Solomon's kingdom.
In 1 Kings 2:29, Solomon again sends Benaiah to execute Joab — the same pattern of royal justice via the same agent.
In 2 Samuel 1:15, David orders the Amalekite killed — a king commanding immediate execution by a servant, mirroring Solomon's order here.
Proverbs 17:11 describes rebellious evildoers receiving a messenger of death — exactly what happens to Adonijah here.
In 2 Samuel 4:12, David orders the execution of Ish-bosheth's murderers — another example of royal justice carried out by subordinates.
Ecclesiastes 8:4 affirms the king's supreme word — Solomon's command to kill Adonijah demonstrates this authority.