So Banaias the son of Joiada went up, and setting upon him slew him, and he was buried in his house in the desert.

And Benaiah the son of Jehoiada went up and fell upon him, and put him to death; and he was buried in his own house in the wilderness.

And Benaiah son of Jehoiada goeth up and falleth upon him, and putteth him to death, and he is buried in his own house in the wilderness,

So Benaiah, the son of Jehoiada, went up, and falling on him, put him to death; and his body was put to rest in his house in the waste land.

And so Benaiah, the son of Jehoiada, went up and, attacking him, put him to death. And he was buried in his own house in the desert.

Retribution overtook Joab on the very scene (Gibeon) of the most treacherous of his murders. It was at the "great stone which is in Gibeon" that Joab killed Amasa 2-Samuel 20:8-10.

So Benaiah - went up - and slew him - It appears he slew him at the very altar. Joab must have been both old and infirm at this time, and now he bleeds for Abner, he bleeds for Amasa, and he bleeds for Uriah. The two former he murdered; of the blood of the latter he was not innocent; yet he had done the state much service, and they knew it. But he was a murderer, and vengeance would not suffer such to live.

So Benaiah the son of Jehoiada went up,.... To Gibeon, which was a great high place, 1-Kings 3:4;
and fell upon him, and slew him; at the altar; or, dragging him from it at some distance, drew his sword and slew him:
and he was buried in his own house in the wilderness; not in his dwelling house strictly taken, but in a garden or field adjoining to it, which house in the wilderness; not a waste place uninhabited; for, as Kimchi observes, this word sometimes signifies a place uninhabited, though not tilled, but left for pasture of cattle; and in such a place might Joab's house be, at least his country house, where he might have a farm, and fields, and cattle, as it is plain he had, 2-Samuel 14:30.

SHIMEI PUT TO DEATH. (1-Kings 2:34-46)
Benaiah . . . went up, and fell upon him--According to the terms of the statute (Exodus 21:14), and the practice in similar cases (2-Kings 11:15), the criminal was to be dragged from the altar and slain elsewhere. But the truth is, that the sanctity of the altar was violated as much by the violence used in forcing the criminal from the place as in shedding his blood there; the express command of God authorized the former and therefore by implication permitted the latter.
was buried in his own house--or family vault, at his property in the wilderness of Judah. His interment was included in the king's order, as enjoined in the divine law (Deuteronomy 21:23).

Benaiah went up (ויּעל), inasmuch as the altar by the ark of the covenant stood higher up Mount Zion than Solomon's house. Joab was buried "in his house" (i.e., in the tomb prepared in his house, either in the court or in the garden: cf. 1-Samuel 25:1), "in the desert," probably the wilderness of Judah, as Joab's mother was a step-sister of David, and therefore probably dwelt in the neighbourhood of Bethlehem.

Wilderness - Places which have but few houses and inhabitants, are often so called in scripture. He was buried privately, like a criminal, not pompously, like a general.