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.

Ver. 5. What Joab the son of Zeruiah did to me.] Why, what did Joab to David? Pellican justifieth him, and commendeth Joab highly for a good man; but few interpreters are of his mind. David had much ado with him all along, and complained of his insolences, which yet he dared not punish, till in his old age the armies fell off from him, and Benaiah, captain of the guard, was able to deal with him. What is it that David here meaneth which Joab had done against him, is uncertain. The Hebrews tell us, that he showed David's letters to him concerning the death of Uriah, which was much to his disgrace. Others hold that the death of Absalom still stuck in David's stomach, together with that rough and rude language which Joab gave him for his excessive mourning thereupon. Theodoret thinketh it was his siding with Adonijah, and the evil that he might yet work against Solomon, whom he never loved, but held him unworthy to reign for his scandalous birth.

And what he did to the two captains, &c.] This seemeth to be the very thing that he did against David; for besides that the sovereign is smitten in the subject, David had given the public faith to these two captains for their safety, and, therefore, appropriateth their slaughter, as good reason he had.

And put the blood of war upon his girdle, &c.] In a bold and public way, as if he had bragged of his murders; like as Alexander Pheraeus is said to have consecrated the javelin wherewith he slew his uncle Polyphron, and called it his god Tychon, of great luck. a

a Plutarch, in Pelopida.