But the sons of Belial shall be all of them as thorns - There is no word in the text for sons; it is simply Belial, the good-for-nothing man, and may here refer - first to Saul, and secondly to the enemies of our Lord.
As thorns thrust away - A metaphor taken from hedging; the workman thrusts the thorns aside either with his bill or hand, protected by his impenetrable mitten or glove, till, getting a fair blow at the roots, he cuts them all down. The man is fenced with iron, and the handle of his bill is like the staff of a spear. This is a good representation of the dubbing-bill, with which they slash the thorn hedge on each side before they level the tops by the pruning-shears. The handle is five or six feet long. This is a perfectly natural and intelligible image.

But the man that shall touch them must be fenced with iron and the staff of a spear,.... To remove these thorns, or sons of Belial, out of the way, or to defend himself against them; or weapons of war must be made use of to conquer and destroy them, according to the sense of Ben Gersom, and which De Dieu follows; a man that meddles with them must expect to be as much hurt and wounded by them, all over the body, as if not only the point or iron head of a spear, but the wood or handle of the spear, were thrust up in him; but the former sense seems best:

and they shall be utterly burnt with fire in the same place: where the thorns grew, or whither they are removed, or are sitting; where persons are sitting to warm themselves by them: and this may be understood of the destruction of wicked rulers, when their kingdom is taken from them, and they are consumed root and branch; and was true not only of Saul, and his posterity, as some apply it, and of Jeroboam, and those like to him, as the above Jewish writer; but of the wicked Jews, and their rulers, those sons of Belial, who rejected the yoke of Christ, and would not have him to rule over them; to whom the Lord sent the Roman armies fenced with swords and spears, and burnt their city, and destroyed them in the same place; and may take in antichrist, and antichristian states, those sons of Belial, of the wicked and lawless one, the son of perdition, whose city, Rome, shall be burnt with fire; and even all wicked men, at the great day of judgment, to which the Targum refers these words; when they, whose end, like thorns, is to be burnt, will be cast into the lake which burns with fire and brimstone.