1 Kings 2:5

5 `And also, thou hast known that which he did to me -- Joab son of Zeruiah -- that which he did to two heads of the hosts of Israel, to Abner son of Ner, and to Amasa son of Jether -- that he slayeth them, and maketh the blood of war in peace, and putteth the blood of war in his girdle, that [is] on his loins, and in his sandals that [are] on his feet;

1 Kings 2:5 Meaning and Commentary

1 Kings 2:5

Moreover thou knowest also what Joab the son of Zeruiah did
unto me
In slaying Absalom, contrary to his orders, and in behaving insolently towards him on account of his mourning for him, and at other times; but as these things might not be personally known to Solomon, only by hearsay, this may respect his disloyalty towards him, in joining with Adonijah, who set himself up for king in his lifetime, and without his knowledge and consent; or it may respect the instances next mentioned, in which he did injury to the interest, honour, and character of David:

[and],
or "even",

what he did to the two captains of the host of Israel, unto Abner the
son of Ner, and unto Amasa the son of Jether, whom he slew;
to Abner who was under Ishbosheth, and Amasa under David, who had not only the promise of the post, but was actually in it when Joab slew him; and indeed out of envy to him for it:

and shed the blood of war in peace;
when they were at peace with him, as if they had been in open war; and even under a pretence of friendship to them, asking of their peace and welfare, as if he meant nothing less than to behave peaceably towards them; hence the Targum is,

``whom he slew in craftiness:''

and put the blood of war upon the girdle that [was] about his loins,
and in his shoes that [were] in his feet;
which particularly respects the affair of Amasa, whose blood he shed with his sword, that dropped out of its scabbard, girded upon his loins, and into which he put it again, all over bloody, and wore it girded upon his loins; and which he also stooped for when it fell, as if he was going to unloose or buckle his shoes, and into which the blood ran down when he stabbed him; and after this barbarous action marched on without any shame or remorse, with his bloody sword on his loins, and the blood of the murdered in his shoes.

1 Kings 2:5 In-Context

3 and kept the charge of Jehovah thy God, to walk in His ways, to keep His statutes, His commands, and His judgments, and His testimonies, as it is written in the law of Moses, so that thou dost wisely all that thou dost, and whithersoever thou turnest,
4 so that Jehovah doth establish His word which He spake unto me, saying, If thy sons observe their way to walk before Me in truth, with all their heart, and with all their soul; saying, There is not cut off a man of thine from the throne of Israel.
5 `And also, thou hast known that which he did to me -- Joab son of Zeruiah -- that which he did to two heads of the hosts of Israel, to Abner son of Ner, and to Amasa son of Jether -- that he slayeth them, and maketh the blood of war in peace, and putteth the blood of war in his girdle, that [is] on his loins, and in his sandals that [are] on his feet;
6 and thou hast done according to thy wisdom, and dost not let his old age go down in peace to Sheol.
7 `And to the sons of Barzillai the Gileadite thou dost do kindness, and they have been among those eating at thy table, for so they drew near unto me in my fleeing from the face of Absalom thy brother.
Young's Literal Translation is in the public domain.