1 Kings 2:5

Joab. These instructions given by David to his son, with relation to Joab and Semei, proceeded not from any rancour of heart, or private pique; but from a zeal for justice: that crimes so public and heinous might not pass unpunished. (Challoner) --- David and Solomon esteemed themselves, in a manner, defiled, as long as these continued unpunished, ver. 31. Joab had behaved to David with great insolence, after the death of Absalom. (Haydock) --- He had lately sided with Adonias. (Menochius) --- But what touched the good old king more particularly, were the treacherous murders of two great generals, who had put themselves under his protection, and were endeavouring to promote his welfare. Only the fear of greater commotions had hitherto prevented David from bringing his nephew to public execution, as the people expected. He deemed it requisite to remind his successor of this obligation, when his power should be sufficiently strong, that the impunity of such daring offenders might not destroy the commonwealth. (Haydock) --- Peace. Pretending affection. Joab had treated Abner and Amasa as the worst of enemies, and their blood had stained his garments. (Menochius)