1 Kings 2:25

Solomon sent by the hand of Benaiah, the son of Jehoiada— It was formerly very customary among princes to employ their officers, or greatest confidants, in such executions. Among the Romans, the soldiers were always the persons who carried to prison, to torture, or to execution, such as were found guilty of any offence; and this Tertullian makes an argument to dissuade Christians from engaging in the wars, lest thereby they should be obliged to imprison, punish, or execute malefactors. In Daniel 2:24 we read, that Nebuchadnezzar sent Arioch, who was chief commander of his troops, to destroy the wise men of Babylon, because they could not interpret his dream; and therefore we need less wonder, that we find Solomon employing Benaiah, the captain of the guard, on the like office: but whether he did not first drag Joab (1 Kings 2:34.) from the altar, before he slew him, for fear of polluting the holy place with blood, or whether Solomon did not rather think fit to have him killed even at the altar, and let all men see that no place, though never so sacred, should secure any man from the hand of justice, commentators have not agreed. See Exodus 21:14.